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Table 3 Factors affecting FENO by linear regression analysis, without controlling for any other factors Magnitude of effect = change compared to reference group (females, non-smokers, non-atopics, non-rhinitics, non-wheezers, or non-asthmatics)

From: Factors affecting exhaled nitric oxide measurements: the effect of sex

  All Males Females
Factor Magnitude of effect* Significance Magnitude of effect* Significance Magnitude of effect* Significance
Female Gender 0.7605 <0.0001 --- ---
BMI 1.0015 0.7571 1.0045 0.5600 0.9966 0.5503
Height 1.0013 <0.0001 1.0003 0.5859 1.0007 0.0969
FEV 1 1.1315 <0.0001 0.9956 0.9328 1.0229 0.7230
FEV 1 % predicted 0.9957 0.0166 0.9988 0.6422 0.9981 0.4432
FVC 1.1058 <0.0001 0.9832 0.6963 1.0443 0.4044
Current smoker (smoked on day of testing) 0.49600 <0.0001 0.43350 <0.0001 0.54337 <0.0001
Current smoker (within last 12 months, not smoked on day of testing) 0.90579 0.0825 0.82377 0.0091 0.89582 0.1945
Atopy (≥3 mm) 1.6028 <0.0001 1.60363 <0.0001 1.5472 <0.0001
Log IgE 1.3897 <0.0001 1.3971 <0.0001 1.3235 <0.0001
Current rhinitis 1.3126 <0.0001 1.2868 0.0002 1.3670 <0.0001
Current wheeze 1.1009 0.0617 1.0906 0.2349 1.1004 0.1658
Current asthma 1.4132 <0.0001 1.4434 <0.0001 1.3495 0.0003
Using ICS 1.3904 0.0004 1.3780 0.0134 1.3755 0.0130