TABLE 1

Participant characteristics

CategoryTotal n=3979
Male1731 (43.5)
Ancestry
 Black African1699 (42.7)
 Caucasian463 (11.6)
 Mixed ancestry1683 (42.3)
 Other134 (3.4)
School type
 Public3771 (94.8)
 Private208 (5.2)
Highest level of maternal education
 Primary school298 (7.5)
 Secondary2002 (50.3)
 Tertiary1597 (40.1)
 Not reported82 (2.1)
Previous tuberculosis treatment279 (7.0)
Outdoor pollution1334 (33.5)
Self-reported smoking (current)348 (8.8)
Maternal smoking982 (24.7)
Paternal smoking1402 (35.2)
Wood used for heating or cooking288 (7.2)
Exposure to pets2711 (68.1)
Mother or father employed3523 (88.5)
Home type – informal home417 (10.5)
Household assets (<7 items)1975 (49.6)
Body mass index kg·m−2
 Less than 18.51105 (27.8)
 18.5 to 24.992119 (53.2)
 Above 25747 (18.8)
 Not reported8 (0.2)