Table 1 Characteristics of the original cohort and the sample with complete data of sedentary behavior and pulmonary function
From: Screen-based sedentary behavior during adolescence and pulmonary function in a birth cohort
Variable | Original Cohort - perinatal N (%) | Sample with exposure and outcome data N (%) | p* |
|---|---|---|---|
Number of participants | 5249 (100) | 3382 (100) | - |
Sex | 5248 (100) | 3382 (100) | 0.291 |
 Male | 2606 (49.7) | 1640 (48.5) |  |
 Female | 2642 (50.3) | 1742 (51.5) |  |
Skin color | 4323 (100) | 3382 (100) | 0.996 |
 White | 2769 (64.1) | 2166 (64.0) |  |
 Black | 611 (14.1) | 486 (14.4) |  |
 Brown | 784 (18.1) | 606 (17.9) |  |
 Yellow | 76 (1.8) | 61 (1.8) |  |
 Indigenous | 83 (1.9) | 63 (1.9) |  |
Family income (quintiles) | 5137 (100) | 3324 (100) | 0.582 |
 1 | 1031 (20.1) | 626 (18.9) |  |
 2 | 1195 (23.2) | 797 (24.0) |  |
 3 | 889 (17.3) | 599 (18.0) |  |
 4 | 1001 (19.5) | 656 (19.7) |  |
 5 | 1021 (19.9) | 646 (19.4) |  |
Maternal schooling (years of formal education) | 5242 (100) | 3376 (100) | 0.297 |
 0 | 130 (2.5) | 70 (2.1) |  |
 1–4 | 1338 (25.5) | 847 (25.1) |  |
 5–8 | 2424 (46.2) | 1621 (48.0) |  |
  ≥ 9 | 1350 (25.8) | 838 (24.8) |  |
Birth weight (grams) | 5232 (100) | 3377 (100) | 0.518 |
  < 2500 | 510 (9.8) | 315 (9.3) |  |
  ≥ 2500 | 4722 (90.2) | 3062 (90.7) |  |
Smoking during pregnancy | 5249 (100) | 3382 (100) | 0.981 |
 No | 3497 (66.6) | 2254 (66.6) |  |
 Yes | 1752 (33.4) | 1128 (33.4) |  |