Table 1 Distribution of selected characteristics according to asthma status (all variables assessed at year 15 except where noted)
CharacteristicsCurrent asthma(n = 246)Never asthma(n = 2644)p Value
Mean age (years)40.1 (3.6)40.2 (3.6)0.61
Women168/246 (68%)1435/2644 (54%)<0.001
    Premenopausal women132/163 (81%)1259/1391 (91%)<0.001
White race119/246 (48%)1443/2644 (55%)0.06
Current smokers53/246 (22%)555/2644 (21%)0.84
Mean FEV1/FVC ratio 5 years previously0.79 (0.18) (n = 210)0.83 (0.11) (n = 2308)0.01
Geometric mean physical activity score (exercise units)186.4 (95% CI 51.6 to 672.8)221.5 (95% CI 61.5 to 797.7)0.04
History of diabetes mellitus21/246 (9%)141/2644 (5%)0.04
Geometric mean insulin resistance2.9 (95% CI 1.6 to 5.3)2.5 (95% CI 1.3 to 4.8)0.002
Use of cholesterol lowering medication9/246 (4%)60/2643 (2%)0.17
Mean BMI (kg/m2)31.6 (8.3)28.4 (6.5)<0.001
    Men28.3 (5.3) (n = 78 )28.2 (5.3) (n = 1209)0.81
    Women33.2 (9.0) (n = 168)28.6 (7.4) (n = 1435)<0.001
        Premenopausal women32.4 (9.2) (n = 132)28.3 (7.2) (n = 1259)<0.001
Mean waist circumference (cm)93.8 (16.1)88.9 (14.8)<0.001
    Men93.6 (12.7) (n = 78 )93. 8 (13.1) (n = 1209)0.91
    Women93.8 (17.4) (n = 168)84.8 (14.9) (n = 1435)<0.001
        Premenopausal women92.3 (18.0) (n = 132)84.2 (14.7) (n = 1259)<0.001
Geometric mean serum adiponectin (mg/l)8.9 (95% CI 4.9 to 16.1)9.0 (95% CI 4.8 to 16.8)0.77
    Men8.0 (95% CI 4.5 to 14.3) (n = 78)7.0 (95% CI 3.8 to 12.9) (n = 1209)0.06
    Women9.3 (95% CI 5.1 to 16.9) (n = 168)11.1 (95% CI 6.3 to 19.3) (n = 1435)<0.001
        Premenopausal women9.8 (95% CI 5.7 to 16.8) (n = 132)11.3 (95% CI 6.5 to 19.7) (n = 1259)0.005
  • For untransformed variables, the data are expressed as mean (SD) (n); for geometric means the data are expressed as mean (95% confidence intervals) (n).

  • The total n value for various comparisons is not uniform because of missing data. The n value for a specific cell is listed in parentheses when it differed from the n value at the top of the column.

  • BMI, body mass index; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.