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Table 1 Characteristics of the study sample by sex, Birth-to-Twenty Plus cohort, Johannesburg, South Africa

From: Longitudinal patterns of physical activity, sedentary behavior and sleep in urban South African adolescents, Birth-To-Twenty Plus cohort

  Males Females
Includeda Excluded P-value Included Excluded P-value
N   669 577   745 577  
SES-asset quintile, %b 1 (lowest) 17 22 0.19 22 28 0.19
2 20 19   18 22  
3 30 31   29 25  
4 22 16   19 15  
5 (highest) 11 12   12 10  
Mother had matriculated from secondary school, %b   29 25 0.24 31 30 0.74
Mother married or in union, %b   29 36 0.32 36 44 0.04
Mother’s age at delivery, % < 25 y 48 47 0.24 47 43 0.28
25–29 y 23 27   24 28  
≥30 y 29 25   29 28  
Child was first-born, %   38 33 0.05 41 32 0.001
  1. aAmong participants who are of Black African ethnicity, provided activity data at ≥2 time points
  2. bAscertained by interview of the mother at child age 7/8 y