Table 1.
Baseline Characteristics of Incident Cases, Control Subjects, and the Total Cohort at Enrollment in the Shanghai Women’s Asthma and Allergy Study, 1997 to 2000
| Cohort (N = 65,372) | Subjects with Incident Asthma (N = 150) | Control Subjects (N = 294) | |
|---|---|---|---|
| Mean age (SD)* | 51.9 (9.0) | 52.5 (8.7) | 52.3 (8.6) |
| Mean BMI (SD)* | 24.0 (3.4) | 24.7 (3.7) | 24.5 (3.4) |
| Smoking (ever)* | 3 | 5 | 3 |
| Education | |||
| College educated | 13 | 16 | 10 |
| High school | 28 | 25 | 27 |
| Middle school | 38 | 39 | 39 |
| <Middle school | 21 | 19 | 24 |
| Any exercise in past 5 yr | 35 | 33 | 34 |
| Family history of asthma | 10 | 27 | 12† |
| Husband smoking | 62 | 61 | 63 |
| Workplace smoking | 38 | 55 | 39‡ |
| Occupation | |||
| Professional | 28 | 26 | 26 |
| Clerical | 21 | 25 | 19 |
| Manual laborer | 51 | 49 | 55 |
| Mean total fat intake (SD), g | 29 (13) | 30 (11) | 29 (12) |
| Mean total kcal intake (SD) | 1,677 (404) | 1,715 (358) | 1,678 (387) |
| Any supplemental vitamin use | 20 | 27 | 18§ |
Definition of abbreviation: BMI = body mass index.
Data are presented as % unless otherwise noted.
*
Indicates matching variable.
†
P < 0.001; comparing cases to control subjects.
‡
P < 0.01; comparing cases to control subjects.
§
P < 0.05; comparing cases to control subjects.