Fig. 1
From: Consequences of chronic kidney disease in chronic obstructive pulmonary disease
Restricted cubic spline plots of the association of eGFR with (a) Modified British Medical Research Council dyspnoea scale; mMRC, (b) timed up and go TuG in seconds, (c) six-minute walk test in meters, (d) St George’s Respiratory Questionnaire; SGRQ, (e) forced expiratory volume in 1 s; FEV1 in % predicted and (f) body mass index; BMI. The red line indicates the estimated change of mMRC, TuG, 6MWT, SGRQ, FEV1 (%pred.) with the respective 95% confidence interval (gray area). a-d are adjusted for age, gender, BMI, FEV1 (% pred.) and cardiovascular comorbidity (CVI 1–5). e and f for age, sex, cardiovascular comorbidity (CVI score) and either BMI or FEV1 (% pred.)