Table 1 Selected epidemiological studies of obesity and asthma indicating an increased risk of asthma in obese individuals
StudyEvaluated populationnTimeReported OR, RR BMI>30
Camargo14Nurses’ Health II859114 years
Women859112.7 (2.3 to 3.1)
Romieu20French E3N Cohort672293 years
Women672292.2 (1.4 to 3.2)†
Chen17Canadian NPHS91492 years
Men42661.0
Women48831.9 (1.1 to 3.4)
Ford21NHANES I954610 years
Men36211.5 (0.9 to 2.6)*
Women59251.4 (1.0 to 1.9)*
Gunnbjörnsdóttir18ECRHS161917.9 years‡
Men76042.1 (1.4 to 3.2)*
Women85871.6 (1.1 to 2.1)*
Huovinen19Finnish Twin Cohort96719 years
Men44493.5 (1.6 to 7.7)
Women52222.3 (0.9 to 6.1)
Nystad16Norwegian Health Surveys13540521 years‡
Men667231.8 (1.4 to 2.3)
Women686822.0 (1.7 to 2.4)
  • The studies by Camargo et al14 and Romieu et al20 evaluated only women. Table adapted from Beuther and Sutherland.22

  • *OR and 95% CI calculated from primary data. †Reported OR comparing BMI ⩾27 with the reference BMI category 20.2–21.4. ‡Mean follow-up.

  • BMI, body mass index; CI, confidence interval; ECRHS, European Community Respiratory Health Survey; NHANES, National Health and Nutrition Examination Survey; NPHS, National Population Health Survey; OR, odds ratio; RR, relative risk.