Adjusted* prevalence ratios for body composition and current asthma and adult-onset asthma among California Teachers Study cohort members
Current asthma | Adult-onset asthma | Adult-onset asthma among women not overweight at age 18 | |
OR* (95% CI) | OR* (95% CI) | OR* (95% CI) | |
BMI at baseline (kg/m2) | |||
<18.5 (underweight) | 1.05 (0.88 to 1.26) | 1.00 (0.81 to 1.24) | 1.03 (0.82 to 1.28) |
18.5–24.9 (normal weight) | 1.00 | 1.00 | 1.00 |
25–29.9 (overweight) | 1.40 (1.31 to 1.49) | 1.45 (1.36 to 1.56) | 1.52 (1.41 to 1.64) |
30–34.9 (obese, class I) | 1.89 (1.73 to 2.05) | 1.97 (1.79 to 2.16) | 2.10 (1.89 to 2.32) |
35–39.9 (obese, class II) | 2.30 (2.03 to 2.59) | 2.52 (2.21 to 2.88) | 2.70 (2.30 to 3.18) |
⩾40 (obese, class III) | 3.30 (2.85 to 3.82) | 3.66 (3.12 to 4.30) | 4.17 (3.33 to 5.22) |
Weight gain since age 18 | |||
Lost weight | |||
⩽25th percentile (5 kg) | 1.00 | 1.00 | 1.00 |
25–49th percentile (5–10 kg) | 1.20 (1.10 to 1.31) | 1.20 (1.08 to 1.33) | 1.19 (1.07 to 1.33) |
50–74th percentile (10.1–18 kg) | 1.34 (1.27 to 1.52) | 1.39 (1.26 to 1.54) | 1.39 (1.25 to 1.55) |
⩾75th percentile (⩾18.1 kg) | 2.12 (1.96 to 2.30) | 2.22 (2.02 to 2.44) | 2.21 (2.00 to 2.43) |
Percentile of waist circumference | |||
⩽25th percentile (<72.4 cm) | 1.00 | 1.00 | 1.00 |
25–49th percentile (72.4–80 cm) | 1.17 (1.07 to 1.28) | 1.21 (1.09 to 1.34) | 1.16 (1.05 to 1.29) |
50–74th percentile (80.1–90 cm) | 1.46 (1.34 to 1.59) | 1.54 (1.39 to 1.70) | 1.49 (1.34 to 1.66) |
⩾75th percentile (⩾90.1 cm) | 2.01 (1.85 to 2.18) | 2.19 (1.99 to 2.41) | 2.13 (1.92 to 2.37) |
Percentile of waist-to-height ratio | |||
⩽25th percentile (⩽0.441) | 1.00 | 1.00 | 1.00 |
25–49th percentile (0.442–0.484) | 1.28 (1.17 to 1.40) | 1.38 (1.24 to 1.53) | 1.37 (1.23 to 1.53) |
50–74th percentile (0.485–0.546) | 1.49 (1.36 to 1.62) | 1.61 (1.45 to 1.79) | 1.59 (1.43 to 1.77) |
⩾75th percentile (⩾0.547) | 2.22 (2.04 to 2.41) | 2.51 (2.27 to 2.77) | 2.50 (2.25 to 2.79) |
*Adjusted for race/ethnicity, age group and cigarette smoking.
BMI, body mass index.