Characteristics of the California Teachers Study population and prevalence of current asthma
| No | Percentage of total study subjects | Percentage with current asthma | |
| Race/ethnicity | |||
| White | 77719 | 88.0 | 7.5 |
| Black or African American | 1990 | 2.3 | 7.6 |
| Hispanic or Latina | 3231 | 3.7 | 8.8 |
| Asian or Pacific Islander | 3036 | 3.4 | 6.8 |
| Other | 2328 | 2.6 | 8.9 |
| Age in 2000–2001 (years) | |||
| <40 | 8551 | 9.7 | 8.0 |
| 40–49 | 15029 | 17.0 | 9.0 |
| 50–59 | 25632 | 29.0 | 8.1 |
| 60–69 | 18039 | 20.4 | 7.2 |
| ⩾70 | 21053 | 23.8 | 6.2 |
| Cigarette smoking | |||
| Never | 56999 | 64.5 | 7.5 |
| Former | 24681 | 28.0 | 8.1 |
| Current | 3842 | 4.4 | 7.2 |
| Unknown | 2782 | 3.2 | 6.4 |
| BMI at baseline (kg/m2) | |||
| 16–18.5 (underweight) | 2156 | 2.4 | 6.6 |
| 18.5–24.9 (normal weight) | 49533 | 56.1 | 6.3 |
| 25–29.9 (overweight) | 21657 | 24.5 | 8.2 |
| 30–34.9 (obese, class I) | 7588 | 8.6 | 10.9 |
| 35–39.9 (obese, class II) | 2578 | 2.9 | 13.4 |
| ⩾40 (obese, class III) | 1334 | 1.5 | 18.3 |
| Unknown or out of range | 3458 | 3.9 | 7.3 |
| BMI at age 18 (kg/m2) | |||
| <25 (not overweight) | 75362 | 85.3 | 7.4 |
| 25–29.9 (overweight) | 6290 | 7.1 | 8.8 |
| ⩾30 (obese) | 2220 | 2.5 | 12.5 |
| Unknown or out of range | 4432 | 5.0 | 7.4 |
| Weight gain since age 18 | |||
| Lost weight | 15044 | 17.0 | 6.7 |
| ⩽25th percentile (<5 kg) | 17392 | 19.7 | 5.8 |
| 25–49th percentile (5–10 kg) | 17416 | 19.7 | 6.7 |
| 50–74th percentile (10.1–18 kg) | 16146 | 18.3 | 7.5 |
| ⩾75th percentile (⩾18.1 kg) | 18349 | 20.8 | 11.0 |
| Unknown | 3957 | 4.5 | 7.2 |
| Percentile* of waist circumference | |||
| ⩽25th percentile (<72.4 cm) | 18461 | 20.9 | 5.9 |
| 25–49th percentile (72.4–80 cm) | 18597 | 21.1 | 6.5 |
| 50–74th percentile (80.1–90 cm) | 16329 | 18.5 | 7.5 |
| ⩾75th percentile (⩾90.1 cm) | 17959 | 20.3 | 10.0 |
| Unknown or ineligible | 16958 | 19.2 | 8.4 |
| Percentile* of waist-to-height ratio | |||
| ⩽25th percentile (⩽0.441) | 17458 | 19.8 | 5.7 |
| 25–49th percentile (0.442–0.484) | 17310 | 19.6 | 6.6 |
| 50–74th percentile (0.485–0.546) | 18253 | 20.7 | 7.2 |
| ⩾75th percentile (⩾0.547) | 17605 | 19.9 | 10.1 |
| Unknown or ineligible | 17678 | 20.0 | 8.3 |
| Total | 88304 | 100.0 | 7.6 |
p<0.01 for all variables (χ2 test).
*Percentiles based only on women with non-missing values.
BMI, body mass index.