Table 1.
Demographics of Infants Tested at 1 Year of Age (n = 508)
| n (%) | |
|---|---|
| Male sex | 259 (50.9) |
| Black African ethnicity | 246 (51.6) |
| Socioeconomic status* | |
| Highest quartile | 115 (22.6) |
| Moderate-high quartile | 115 (22.6) |
| Low-moderate quartile | 152 (29.9) |
| Lowest quartile | 126 (24.8) |
| Preterm | |
| <37 wk gestation | 80 (15.8) |
| <32 wk gestation | 12 (2.4) |
| LRTI | |
| Infants with LRTI | 150 (29.5) |
| >1 LRTI episode | 51 (10.0) |
| Severe LRTI† | 32 (6.3) |
| LRTI total episodes | 234 |
| Hospitalized LRTI | 61/234 (26.0) |
| LRTI requiring oxygen | 27/234 (11.5) |
| Household tobacco smoke exposure, excluding mother (n = 508) | 401 (78.8) |
| Maternal antenatal smoking (n = 491) | 169 (34.4) |
| Maternal alcohol use in pregnancy, high risk (n = 465) | 21 (4.5) |
| Maternal HIV infection‡ | 109 (21.4) |
Definition of abbreviation: LRTI = lower respiratory tract illness.
*
Quartiles are internal comparisons within a low socioeconomic cohort.
†
Severe LRTI was diagnosed in children younger than 2 months with tachypnea (>60 breaths/min) or lower chest wall in-drawing, or in children of any age if the child had a general danger sign.
‡
No infants were HIV infected.