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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)  
  1. *Chi-squared test