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

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

		Males			Females
		Included^a	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

^aAmong participants who are of Black African ethnicity, provided activity data at ≥2 time points
^bAscertained by interview of the mother at child age 7/8 y

ISSN: 1471-2431