Table 1.
Description of the sample, physical activity changes (age 11–15 years), and lung function parameters at age 15 years, by sex. Pelotas 1993 Birth Cohort
| Variable | Male n (%) | Female n (%) |
|---|---|---|
| Smoking during pregnancy | ||
| No | 1,763 (67.7) | 1,733 (65.6) |
| Yes | 843 (32.3) | 909 (34.4) |
| Maternal schooling (years of formal education) | ||
| ≥9 years | 684 (26.3) | 666 (25.2) |
| 5–8 years | 1,214 (46.6) | 1,210 (45.8) |
| 1–4 years | 646 (24.8) | 691 (26.2) |
| 0 | 61 (2.3) | 73 (2.8) |
| Birth weight (grams) | ||
| ≥2,500 | 2,372 (91.3) | 2,350 (89.2) |
| <2,500 | 226 (8.7) | 284 (10.8) |
| Wheezing in the past year | ||
| No | 1,880 (89.0) | 1,921 (86.8) |
| Yes | 233 (11.0) | 291 (13.2) |
| Asthma medication in the past 2 weeks | ||
| No | 2,118 (99.5) | 2,202 (99.5) |
| Yes | 10 (.5) | 11 (.5) |
| Allergy status | ||
| No | 1,624 (76.6) | 1,612 (73.1) |
| Yes | 496 (23.4) | 594 (26.9) |
| Mother's height at birth, cm (mean [SD]) | 159.8 (6.7) | 159.8 (6.8) |
| Adolescent's height, cm (mean [SD]) | 167.2 (8.0) | 159.2 (6.3) |
| Body mass index, kg/cm2 (mean [SD]) | 21.4 (4.0) | 21.6 (3.9) |
| Changes in total PA (11–15 years) | ||
| Inactive–inactive | 401 (19.9) | 958 (45.9) |
| Inactive–active | 459 (22.8) | 361 (17.3) |
| Active–inactive | 379 (18.9) | 464 (22.2) |
| Active–active | 772 (38.4) | 304 (14.6) |
| Changes in leisure-time PA (11–15 years) | ||
| Inactive–inactive | 601 (29.7) | 1,273 (60.7) |
| Inactive–active | 505 (25.0) | 294 (14.0) |
| Active–inactive | 387 (19.1) | 389 (18.6) |
| Active–active | 531 (26.2) | 140 (6.7) |
| FEV1 pre-BD, L (mean [±SD]) | 3.46 (.66) | 2.93 (.44) |
| FVC pre-BD, L (mean [±SD]) | 4.01 (.76) | 3.30 (.51) |
| FEV1 pre-BD, % predicted (mean [±SD]) | 95.64 (13.06) | 107.93 (12.77) |
| FVC pre-BD, % predicted (mean [±SD]) | 103.15 (13.31) | 108.41 (13.44) |
| FEV6 pre-BD, L (mean [±SD]) | 4.00 (.76) | 3.29 (.50) |
| PEF pre-BD, L/s (mean [±SD]) | 7.47 (1.45) | 6.61 (1.04) |
PA = Physical activity; FEV1 = forced expiratory volume in 1 second; FEV6 = forced expiratory volume in 6 seconds; FVC = forced vital capacity; PEF = peak expiratory flow.