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Restricted spirometry and cardiometabolic comorbidities: results from the international population based BOLD study

Respiratory Research volume 23, Article number: 34 (2022) Cite this article

Abstract

Background

Whether restricted spirometry, i.e. low Forced Vital Capacity (FVC), predicts chronic cardiometabolic disease is not definitely known. In this international population-based study, we assessed the relationship between restricted spirometry and cardiometabolic comorbidities.

Methods

A total of 23,623 subjects (47.5% males, 19.0% current smokers, age: 55.1 ± 10.8 years) from five continents (33 sites in 29 countries) participating in the Burden of Obstructive Lung Disease (BOLD) study were included. Restricted spirometry was defined as post-bronchodilator FVC < 5th percentile of reference values. Self-reports of physician-diagnosed cardiovascular disease (CVD; heart disease or stroke), hypertension, and diabetes were obtained through questionnaires.

Results

Overall 31.7% of participants had restricted spirometry. However, prevalence of restricted spirometry varied approximately ten-fold, and was lowest (8.5%) in Vancouver (Canada) and highest in Sri Lanka (81.3%). Crude odds ratios for the association with restricted spirometry were 1.60 (95% CI 1.37–1.86) for CVD, 1.53 (95% CI 1.40–1.66) for hypertension, and 1.98 (95% CI 1.71–2.29) for diabetes. After adjustment for age, sex, education, Body Mass Index (BMI) and smoking, the odds ratios were 1.54 (95% CI 1.33–1.79) for CVD, 1.50 (95% CI 1.39–1.63) for hypertension, and 1.86 (95% CI 1.59–2.17) for diabetes.

Conclusion

In this population-based, international, multi-site study, restricted spirometry associates with cardiometabolic diseases. The magnitude of these associations appears unattenuated when cardiometabolic risk factors are taken into account.

Background

Restrictive lung function is defined as reduced lung expansion expressed as a decreased total lung capacity. It may reflect several underlying conditions and diseases, such as interstitial lung diseases, pleural effusions and disorders, thoracic deformities, neuromuscular diseases, diaphragmatic disorders, obesity, heart failure, pregnancy and pain [1]. Dynamic spirometry has limitations in identifying restrictive lung diseases [2], but it can effectively exclude a restrictive disease when forced vital capacity (FVC) is normal. Further, restricted spirometry is clinically relevant as it is prevalent and associated with impaired quality of life and increased mortality [2,3,4,5,6].

Restricted spirometry has been associated with being female, elderly, heavy smoker, underweight or obese, and manual worker in industry [3, 7,8,9]. A history of tuberculosis, particularly in low- and middle-income countries where this is common is an additional risk factor [10, 11]. Several North American and European studies have reported an association of restrictive lung function with heart disease, hypertension, and diabetes [12,13,14,15,16]. Low FVC has also been associated with markers of cardiometabolic disease [17,18,19,20]. In addition, it has been recently shown that reduced lung function (defined as forced expiratory volume in the first second (FEV1) below 80% of predicted) in early adulthood is associated with a higher and earlier incidence of respiratory, cardiovascular and metabolic comorbidities later in life [21].

Within the Burden of Obstructive Lung Disease (BOLD) study, an international population-based study covering a great number of countries with different ethnic, economic and socio-cultural backgrounds, we investigated the association between the presence of restricted spirometry and the presence of self-reported physician-diagnosed cardiovascular (CVD), hypertension and diabetes, taking into account risk factors like age, sex, education, smoking and body mass index (BMI). In addition, we stratified the results for high- and low-/middle-income countries.

Methods

Study design and participants

The design and rationale for the BOLD initiative have been previously published [22]. A random sample population strategy was used for recruitment of participants from all study sites. In total, 33 sites (Table 1) completed data collection and were included in this analysis. Each participating site aimed to recruit a sample of at least 300 men and 300 women who were not institutionalized, were aged ≥ 40 years, and were living in a well-defined administrative area in which the total population exceeded 150,000. Participants were interviewed by means of a questionnaire and underwent a standardized assessment. Approval was obtained from each local ethics committee, and written informed consent was obtained from each participant. Participants between 40 to 89 years, with a usable postbronchodilator lung function and smoking history were extracted from the BOLD database. Those with complete data on subject characteristics, comorbidities and lung function were selected for this study.

Table 1 General characteristics of study participants at each site and overall
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Assessments

Questionnaire

Questionnaire data was obtained by face-to-face interviews conducted by trained and certified staff in the participant's native language. All participants completed a core questionnaire, based on standardised instruments, which included information on risk factors for lung disease and comorbidities [22]. A dichotomous question for self-reported physician-diagnosed comorbidities, such as heart disease, stroke, hypertension or diabetes was used. For example: “Has a doctor or other health care provider ever told you that you had heart disease?” In this analysis, CVD refers to the presence of either heart disease or stroke.

Spirometry

Lung function data were collected using the ndd EasyOne Spirometer (ndd Medical Technologies, Zurich, Switzerland) [23]. Lung function was measured before and 15 min after administration of 200 μg of salbutamol, administered with a metered dose inhaler with volume spacer. Local spirometry technicians were trained and certified. All spirograms were reviewed centrally based on standardised criteria [24]. Restrictive lung function was defined according to the lower limit of normal (< 5th percentile) of the reference values for post-bronchodilator FVC [25]. The Third National Health and Nutrition Examination Survey (NHANES III) equations were used [26].

Anthropometry

Body height was measured to the nearest 0.5 cm. Body weight was assessed to the nearest 0.1 kg after emptying the bladder and with the participants standing barefoot and wearing light indoor clothing. BMI was calculated as body weight/height2 (kg/m2).

Statistical analysis

Statistics were performed in Stata, version 13.1 (Stata Corporation, College Station, TX, USA). The relation between the presence of comorbidities and restrictive lung function, and six other covariates (i.e. known cardiovascular risk factors: sex [27], education (highest level of schooling completed: less than high school, high school, some college) [28], BMI (≤ 18, 18–25, 25–30, > 30 kg/m2) [29], age (40–49, 50–59, 60–69, 70–89 years) [27], smoking status (never, former, current), and accumulated cigarette pack-years (0, 0–10, 10–20, 20–30, > 30)) [30] was analyzed with use of multivariable logistic regression analysis for each site. All regression models were adjusted for sampling weights within each site.

Random effects meta-analyses were performed using, for each site, the odds ratios of CVD, diabetes and hypertension, in participants with restricted spirometry compared to those without restricted spirometry. Additionally, these analyses were stratified by: (1) sex and the adjusted sex-specific odds ratios were compared for males and females by a Z-score after log-transformation; and (2) high- versus low-/middle-income countries based on gross national income per capita, according to World Bank in 2013. Study sites that reported a low number of people with a specific comorbidity (< 20) or with singularity in the data (i.e. no one with both low FVC and that specific comorbidity) were excluded from the meta-analysis because these sites could not be fitted in the model. These sites were mentioned in detail in the legends of the meta-analyses.

Differences were considered to be significant if p was less than 0.05. Heterogeneity across sites was estimated using the I2 statistic. I2 values of 0%, 25%, 50%, and 75% were respectively considered as no, low, moderate, and high heterogeneity, respectively [31].

Results

Study population characteristics

From 23,834 participants aged 40–89 years, with an acceptable post-bronchodilator spirometry and smoking history, 23,623 participants had complete data with regard to subject characteristics and presence of comorbidities (Fig. 1). Fourteen out of 33 study sites (39%) were located in countries with a high-income economy. Overall and per site baseline characteristics are shown in Table 1. Study participants had a mean age of 55.1 ± 10.8 years, were slightly overweight (BMI 26.7 ± 5.5 kg/m2), and approximately half of them were males (47.5%). Most of them were never smokers, and one out of five were current smokers. Several sites in Africa and India had a high percentage of never smokers.

Fig. 1
figure 1

Flow chart of data extraction

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Thirty-two percent of the overall population had a restricted spirometry, with a high variation across sites. The highest prevalence of restricted spirometry was noted in Colombo (Sri Lanka) (81%), but also in sites in Africa, India, the Philippines and Malaysia had strikingly high prevalence of restricted spirometry. Of notice, 12 of 17 sites with a restriction prevalence below 20% were high income sites, compared to only 1 of the 16 sites with a restriction prevalence above 20% (Fig. 2).

Fig. 2
figure 2

Restricted spirometry prevalence among the different sites. Prevalence of restrictive lung function for each site. Red bar gives the overall mean prevalence. Green bars indicate high-income countries, blue low-income countries

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Prevalence of comorbidities

The prevalence was 10.8% for CVD, 26.2% for hypertension and 8.1% for diabetes and, was 10.9%, 28.9%, 8.2% for females, and 10.7%, 23.2%, 7.8% for males (Table 1), respectively. These comorbidities were more prevalent with older age and increasing BMI. The prevalence of CVD increased with an increasing cigarette pack-years and decreased in participants with a higher level of education. Current smokers were less likely to report CVD, hypertension or diabetes. The highest prevalence of CVD was noted in Tartu (Estonia) (37.3%), Krakow (Poland) (32.4%) and Lexington (KY, USA) (29.3%), whereas the lowest prevalence was reported in Ife (Nigeria) (0.2%), Pune (India) (1.4%) and Srinagar (India) (1.4%). The prevalence of hypertension did not differ substantially across countries with exception of Ife in Nigeria (2.3%), Pune in India (5.1%), Krakow in Poland (42.0%), Lexington, KY, in USA (49.1%) and Tartu in Estonia (40.1%). The reported prevalence of diabetes varied across sites, being lowest in Ife (Nigeria) with 0.8% and highest in Riyad (Saudi Arabia) with 29.4%.

The association between restrictive lung function and comorbidities

Overall, participants with restricted spirometry consistently more often reported CVD (OR 1.60, 95% CI 1.37–1.86), diabetes (OR 1.98, 95% CI 1.71–2.29) and hypertension (OR 1.53, 95% CI 1.40–1.66) than those with unrestricted spirometry (Table 2). When considering sex-specific estimates, females with restricted spirometry more often reported hypertension, and diabetes, while men more often reported CVD. Regarding between-sites heterogeneity, an overall moderate heterogeneity (I2 47.6%; p = 0.015) was reported for CVD and diabetes (I2 47.7; p = 0.008). Non-significant low heterogeneity across sites was observed for hypertension (I2 19.7%; p = 0.164).

Table 2 Meta-analysis of the unadjusted and adjusted odds ratios for cardiovascular disease, diabetes and hypertension in participants with restricted spirometry
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After adjusting for sex, age, BMI, smoking status, pack-years and education, the presence of restrictive lung function was still strongly associated with CVD (OR 1.54, 95% CI 1.33–1.79), hypertension (OR 1.50, 95% CI 1.39–1.63) and diabetes (OR 1.86, 95% CI 1.59–2.17) (Figs. 3, 4, 5). The meta-analyses stratified by sex showed similar odds ratios as the joint analysis (Table 2).

Fig. 3
figure 3

Forest plot showing the meta-analysis of odds ratios for CVD in participants with restricted spirometry compared with those without it adjusted for sex, age, BMI, smoking (pack-years and current status) and education. Heterogeneity chi-squared = 40.13, d.f. = 26 (p = 0.038). I-squared (variation in ES attributable to heterogeneity) = 35.2%. Estimate of between-study variance Tau-squared = 0.0523. Test for overall effect: Z = 5.66 (p < 0.001). The following sites could not be included in the analysis due to a low number of subjects reporting CVD or singularity in the data: Blantyre (Malawi), Ife (Nigeria), Mumbai (India), Penang (Malaysia), Pune (India), Srinagar (India)

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Fig. 4
figure 4

Forest plot showing the meta-analysis of the adjusted odd ratios for hypertension in participants with restricted spirometry compared to those without it adjusted for sex, age, BMI, smoking (pack-years and current status) and education. Heterogeneity chi-squared = 28.29, d.f. = 31 (p = 0.606). I-squared (variation in ES attributable to heterogeneity) = 0.0%. Estimate of between-study variance Tau-squared = 0.0000. Test for overall effect: Z = 9.94 (p < 0.001). The following sites could not be included in the analysis due to a low number of subjects reporting hypertension: Ife (Nigeria)

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Fig. 5
figure 5

Forest plot showing the meta-analysis of the adjusted odds ratios for diabetes in participants with restricted spirometry compared to those without it adjusted for sex, age, BMI, smoking (pack-years and current status) and education. Heterogeneity chi-squared = 45.34, d.f. = 25 (p = 0.008). I-squared (variation in ES attributable to heterogeneity) = 44.9%. Estimate of between study variance Tau-squared = 0.622. Test for overall effect: Z = 7.77 (p < 0.001). The following sites could not be included in the analysis due to a low number of subjects reporting diabetes or singularity in the data: Cotonou (Benin), Guangzhou (China), Ife (Nigeria), Nampicuan Talugtug (Philippines), Naryn (Kyrgyztan), Pune (India), Srinagar (India)

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Association of restricted spirometry with comorbidities stratified by low-/middle- and high-income countries and sex is presented in Table 3. In general, the association between the presence of restricted spirometry and comorbidities persisted in both high- and low-/middle-income countries.

Table 3 Meta-analysis of the unadjusted and adjusted odds ratios by sex and low- and high-income countries for cardiovascular disease, diabetes and hypertension in subjects with restricted spirometry
Full size table

Discussion

In this population-based study including 33 sites from 29 countries involving more than 23,000 individuals with high-quality post-bronchodilator spirometry, restricted spirometry was associated with the prevalence of self-reported diabetes, hypertension, and CVD. These associations were barely attenuated by age, sex, smoking, BMI and education. These findings were consistent across sites, regardless of gross national income.

We found a high variation across sites in prevalence of restrictive spirometry, with higher prevalence in low-/middle-income countries (particularly Asian and African countries). We purposively used the NHANES III prediction equations for Caucasians for all sites [26, 32]. The use of locally derived reference equations from our study sample would prevent to reveal all environmental influences. Literature supports that differences in ethnicity have minor influence on lung development in relation to environment [5]. Use of race- or ethnicity-based predictive equations is controversial, and assumptions that observed variations in lung function are due to race or ethnicity should be avoided [33]. Rather, studies such as BOLD highlight the marked differences in developmental and environmental exposures across populations that affect lung growth and mature lung function. In the BOLD study, for example 15.4% of participants in Cape Town (South Africa) and 10.8% in Manila (Philippines) (reported prevalence of FVC below the lower limit of normal (LLN) 46.5% and 62.4%, respectively) self-reported a history of tuberculosis [10, 34], and the actual prevalence of tuberculosis in those regions may be higher.

In line with our results, several other population-based studies consistently reported the positive association between restrictive lung function and cardiovascular diseases [14, 35]. Lindberg et al. measured cardiovascular disease in subjects with restricted, obstructed and normal lung function. They reported a lower prevalence of CVD in restricted than in obstructed participants, but a higher prevalence in restricted than in healthy persons [14]. Eriksson et al. reported that heart disease among subjects with restrictive lung function was about three to six times more prevalent compared to those with normal spirometry. The proportion of hypertension in restrictive subjects was similar to that in subjects with Chronic obstructive pulmonary disease (COPD) stage 3 and 4 [35]. Previous research also demonstrated that the risk for experiencing a cardiovascular event in subjects with restricted lung function during 15-years follow-up was similar to subjects with moderate airflow limitation indicating COPD [12].

In the above studies, a restrictive spirometry pattern has been commonly described as a decreased FVC in combination with a normal or increased FEV1/FVC ratio, and then compared to an obstructive spirometry pattern independent of FVC. This likely ignores the potential coexistence of a restriction in vital capacity in subjects with obstructive lung function. More severe static hyperinflation related to severe airflow limitation might result in a decreased vital capacity, but this is uncommon in a population-based study. We previously showed that the association of CVD and hypertension with airflow limitation in this study population was largely explained by age and smoking habits and that the adjusted risk for diabetes was even lower in subjects with airflow limitation [36]. Here we aimed to focus on the association between low FVC and cardiometabolic comorbidities independent of the presence or absence of airflow limitation and showed a much stronger association for restrictive spirometry with cardiometabolic comorbidities compared to our previous findings related to obstructive spirometry. Hence, previous reported associations of cardiometabolic comorbidities with obstructive spirometry in population studies might be partly explained by coexistent restriction.

It has been suggested that poor nutritional status is a risk factor for impaired lung function [37, 38]. In a longitudinal population study, Ubilla et al. reported that low BMI in adults associates with low FEV1 and FVC. In the present study, of the 10 countries with the lowest BMI, 8 had a restricted spirometry prevalence of over 40%, which all were low-/middle- income countries. On the other hand, obesity has been associated with decreased vital capacity in several observational studies [14, 39, 40]. In this study, we observed lower FVC in countries with a high prevalence of obesity, like the United States of America. Also, significant association between restrictive lung function and diabetes has been shown [3, 41]. A potential explanation for the association between low FVC and the presence of diabetes could be through obesity and related insulin resistance. Nevertheless, even after adjustment for BMI, the adjusted odds ratio did not alter the significant association in the present study. In line with this, the presence of diabetes has been shown to be associated with a restrictive lung function pattern in a meta-analysis [42]. Furthermore, subclinical impairment of lung function was seen in children with type 1 diabetes mellitus and was associated with disease duration and the degree of metabolic control [43]. This might not surprise as the large vascular network and high collagen and elastin composition of the pulmonary system, is prone to microvascular damage and nonenzymatic glycation in diabetes.

There is increasing attention for the potential role of early life events and their role in lung function and other organ function development. Restricted lung function could be the result of suboptimal lung development, related to environmental influences in utero, during early childhood and adolescence. Prenatal foetus’s exposure, thereafter childhood environmental exposure, respiratory infections and nutritional influences are potential contributing factors to suboptimal lung development. Agusti et al. described the abnormal lung development and suggested that lower lung function, might be related to suboptimal development of the other organs, which might relate to an earlier and higher prevalence of comorbidity [21, 44]. This is a potential explanation for the association seen in the current study between low lung function and the presence of comorbidities.

The stratified results for low-/middle- and high-income countries yielded comparable outcomes for hypertension and diabetes, although the associations between comorbidities and restricted spirometry were less strong in low-/middle-income countries. This could be related to the high proportion of subjects with restrictive lung function in low-/middle-income countries which could dilute the effect size. On the other hand, the effect of a lower socioeconomic status on underestimating the prevalence of non-communicable diseases has been reported to be more pronounced in countries with low-income economies compared to those with high-income economies [45].

In high income countries, in which the NHANES III reference equations might be more applicable, the main objective and outcome of this study, that restrictive lung function is strongly associated with cardiometabolic comorbidities is confirmed.

By its cross-sectional design, the current general population study describes the association between restricted spirometry and cardiometabolic comorbidity. The strictly standardized spirometry is one of the main strengths of the current study. Another strength of this study is that a great number of population-based samples worldwide, accounting for regional differences with regard to exposure [46] and potential ethnical and socioeconomical differences were investigated. Remarkably, the meta-analyses had low to moderate heterogeneity across study sites. Limitations of the current study include healthy participant bias and the self-reported nature of the comorbidity assessment. As discussed, we purposively used the same prediction equations for all countries as NHANES III [26]. The use of locally derived reference equations from our study sample would prevent to reveal all environmental influences.

Conclusion

In conclusion, the results of the international BOLD study show that on the population level, subjects with restricted spirometry are more often affected by CVD, hypertension and diabetes. Furthermore, this association is not attenuated by the presence of common risk factors, such as aging and smoking. These findings emphasize the urgent need to understand better the mechanisms underlying the association between impaired lung function and cardiometabolic disease, particularly in low-income countries where restrictive lung function is more prevalent and a shift from communicable diseases to non-communicable diseases is underway.

Availability of data and materials

The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

BMI:

Body Mass Index

BOLD:

Burden of Obstructive Lung Disease

CI:

Confidence Interval

COPD:

Chronic Obstructive Pulmonary Disease

CVD:

Cardiovascular disease

FEV1 :

Forced expiratory volume in the first second

FVC:

Forced vital capacity

LLN:

Lower limit of normal

NHANES III:

The Third National Health and Nutrition Examination Survey

OR:

Odd ratio

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Acknowledgements

The authors thank the participants and field workers of this study for their time and cooperation, and the BOLD Coordinating Centre members not included in the author list for their technical and scientific support. BOLD wishes to acknowledge the contributions of Georg Harnoncourt of the ndd Corporation and Paul Enright for their assistance with spirometry training and quality control during the study.

Funding

Open access funding provided by University of Gothenburg. The BOLD Study was funded by a grant from The Wellcome Trust (085790/Z/08/Z), which supported the London, UK Co-ordinating Centre, and in part by unrestricted educational grants to the initial Co-ordinating Centre in Portland, OR, USA from Aventis, AstraZeneca, Boehringer-Ingelheim, Chiesi, GlaxoSmithKline, Merck, Novartis, Pfizer, Schering-Plough, Sepracor and the University of Kentucky (Lexington, KY). LEGWV received funding from Kamprad Family Foundation (ref. 20190024), Hjärt-lungfonden (nr. 20200150) and Swedish government and country council ALF Grant (ALFGBG-824371). None of the funding bodies had a role in the design of the study, collection, analyzes or interpretation of data, in the writing of the manuscript or in the decision to publish the results.

Author information

Author notes

  1. Katarzyna Kulbacka-Ortiz and Filip J. J. Triest contributed equally to the manuscript and are co-first authors

Authors and Affiliations

  1. COPD Center, Department of Respiratory Medicine and Allergology, Sahlgrenska University Hospital, Gothenburg, Sweden

    Katarzyna Kulbacka-Ortiz & Lowie E. G. W. Vanfleteren

  2. Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

    Katarzyna Kulbacka-Ortiz & Lowie E. G. W. Vanfleteren

  3. CIRO, Centre of Expertise for Chronic Organ Failure, Horn, the Netherlands

    Filip J. J. Triest, Frits M. E. Franssen & Emiel F. M. Wouters

  4. Department of Respiratory Medicine, AZ Sint-Lucas, Gent, Belgium

    Filip J. J. Triest

  5. Department of Respiratory Medicine, MUMC+, Maastricht University Medical Centre, Maastricht, the Netherlands

    Filip J. J. Triest, Frits M. E. Franssen & Emiel F. M. Wouters

  6. Department of Pneumology, Paracelsus Medical University, Salzburg, Austria

    Michael Studnicka

  7. Kaiser Permanente Center for Health Research, Portland, OR, USA

    William M. Vollmer

  8. Department of Pulmonary Medicine, Kepler-University-Hospital, Linz, Austria

    Bernd Lamprecht

  9. Faculty of Medicine, Johannes-Kepler-University, Linz, Austria

    Bernd Lamprecht

  10. National Heart and Lung Institute, Imperial College London, London, UK

    Peter G. J. Burney & Andre F. S. Amaral

  11. Ludwig Boltzman Institute for Lung Health, Vienna, Austria

    Emiel F. M. Wouters

Authors
  1. Katarzyna Kulbacka-Ortiz
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  2. Filip J. J. Triest
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  3. Frits M. E. Franssen
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  4. Emiel F. M. Wouters
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  5. Michael Studnicka
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  6. William M. Vollmer
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  7. Bernd Lamprecht
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  8. Peter G. J. Burney
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  9. Andre F. S. Amaral
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  10. Lowie E. G. W. Vanfleteren
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Contributions

MS, BL, PGJB, LEGWV contributed to conception and study design. KKO, FJJT, MS, WMV, PJGB, LEGWV analyzed the data. KKO, FJJT, WMV, PJGB, LEGWV interpreted the data. All authors contributed to drafting the article or revising it critically for important intellectual content and gave final approval of the version to be published. All authors take responsibility for the integrity of the data and accuracy of the data analysis. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Lowie E. G. W. Vanfleteren.

Ethics declarations

Ethics approval and consent to participate

Approval was obtained from each local ethics committee, and written informed consent was obtained from each participant. Indian Institute of Environmental Medicine, Mumbai, India, approval IIEM/IEC/005/2004-05; Chest Research Foundation Independent Ethics Committee, KEM Hospital Research Centre, Pune, India, approval 19/6/2008, KEMHRC/VSP/Dir.Off/EC/539 and KEMHRC ID No. 0931; Sher-I-Kashmir Institute of Medical Sciences, Srinagar, India, approval SIMS-1-31-IEC/2010-2557 (research protocol 6/2010); Philippine National Ethics Committee, Philippines approval 7/3/2008; University of Cape Town, Cape Town, South Africa, approval 152/2003; Kyrgyz National Centre of Cardiology and Internal Medicine, approval 01-7/49 of 6/2/2013; Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Nigeria, approval ERC/2011/01/04; Etablissement Hospitalier Specialise Universitaire de Medecine Physique et Readaptation de Seraidi, approval 13/S/M/2012; Comite National d’Ethique de la Recherche pour la Sante Humaine, approval 2013/11/373/L/CNERSH/SP; University Hospital Farhat Hached, Sousse, Tunisia, approval 24/4/2010; University of Tartu, Tartu, Estonia, approval 118/53; National Bioethics Committee, Reykjavik, Iceland, approval 04-080; Regional Committee for Medical and Health Research Ethics of Western Norway (REK Vest), Bergen, Norway, approval 098.05; Regional Ethical Review Board in Uppsala, Uppsala, Sweden, approval 2006/146; Bioethics Committee of the Jagiellonian University Medical School, Krakow, Poland, approval KBET/36/B/2005; Charing Cross Hospital, London, UK, approval 06/Q0411/97; Hannover Medical School, Hannover, Germany, approval 3804/2004; University of Kentucky, Lexington, Kentucky, approval 04-0714-F3R; Hospital Pulido Valente, Lisbon, Portugal, approval CE/25/07 (Estudo 21/07); Academic hospital of Maastricht (azM) and Maastricht University (UM), Maastricht, The Netherlands, approval MEC-062-084; Ethics Committee for the State of Salzburg, Salzburg, Austria, approval 556/10a; University of Sydney, Sydney, Australia, approval 12-2005/1/8641; University of British Columbia/Providence Health Care, approval P05-0061; Adana Valiligi Provincial Health Directorate, Adana, Turkey, approval 03-15-442; Guangzhou Institute of Respiratory Disease, Guangzhou, China, approval 2003-01; Philippine National Ethics Committee, Philippines, approval 9/8/2005; Ethics Review Committee of the Faculty of Medicine of the University of Kelaniya, Sri Lanka (FWA00013225), approval P5/01/2011; National Bioethics Committee, Ministry of Health, Republic of Albania, approval 18 (10/6/2011); National Guard-Health Affairs, King Abdulaziz Medical City, Institutional Review Board, approval IRBC/038/11 (5/3/2011); Joint Penang Independent Ethics Committee, approval JPEC 12-12-0202 (11/12/2012).

Consent for publication

Not applicable.

Competing interests

FMEF reports grants and personal fees from AstraZeneca, personal fees and non-financial support from Boehringer Ingelheim, personal fees from Chiesi, personal fees from GlaxoSmithKline, personal fees from Novartis, non-financial support from TEVA, outside the submitted work. KKO, FJJT, BL, PGJB, EFMW, WMV, AFSA, MS, LEGWV report no competing interests.

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Kulbacka-Ortiz, K., Triest, F.J.J., Franssen, F.M.E. et al. Restricted spirometry and cardiometabolic comorbidities: results from the international population based BOLD study. Respir Res 23, 34 (2022). https://doi.org/10.1186/s12931-022-01939-5

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Keywords

Respiratory Research

ISSN: 1465-993X

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