Table 1. Characteristics of the study population (n = 221).
| Characteristic | Total N (%) | 2012–2016 cohort (N = 160) | 2016–2017 cohort (N = 61) | P | |
|---|---|---|---|---|---|
| Age in months (median, IQR) | 6 (3, 12) | 9 (4, 15) | 2 (1, 4) | <0.001 | |
| Female sex | 110 (50) | 73 (46) | 37 (61) | 0.05 | |
| HIV exposure statusa (n = 213) | 0.01 | ||||
| HIV-infected | 9 (4) | 9 (6) | 0 (0) | ||
| HIV-exposed, uninfected | 63 (30) | 38 (25) | 25 (41) | ||
| HIV-unexposed | 141 (66) | 105 (69) | 36 (59) | ||
| PCV-13 doses received (n = 220) | 0.01 | ||||
| 0 | 91 (41) | 59 (37) | 32 (53) | ||
| 1 | 29 (13) | 18 (11) | 11 (18) | ||
| 2 | 23 (11) | 17 (11) | 6 (10) | ||
| 3 | 77 (35) | 66 (41) | 11 (18) | ||
Abbreviations: IQR, interquartile range.
a Children were classified as HIV-unexposed, uninfected if their mothers had documented negative HIV testing at or prior to enrollment; children whose mothers tested positive for HIV before or at delivery were classified as HIV-exposed, uninfected if they tested negative for HIV after 6 weeks of age if exclusively formula fed, at least 6 weeks after breastfeeding cessation, or at enrollment.