Table 1.
Baseline Characteristics of Infants
| Infant Characteristics and No. of Infants Assessed for Overall Comparison | Overall | Infants Without Positive PCR for B. pertussis (n = 2013) | Infants With Positive PCR for B. pertussis (n = 8) |
|---|---|---|---|
| Age at enrollment, d, median (IQR) (n = 2017) | 20 (9–41) | 20 (9–41) | 18 (14–26.5) |
| Weight at enrollment, g, median (IQR) (n = 1900) | 3320 (2820–3970) | 3320 (2820–3970) | 3001 (2600–3350) |
| Length at enrollment, cm, median (IQR) (n = 1900) | 51.5 (49.0–53.9) | 51.5 (49.0–54.0) | 51.3 (46.3–51.5) |
| Head circumference at enrollment, cm, median (IQR) | 35.3 (33.8–36.5) | 35.3 (33.8–36.5) | 35.0 (33.0–35.7) |
| Male sex | 52.3% | 62.5% | 52.2% |
| Birth weight, g, median (IQR)a | 2800 (2500–3000) | 2800 (2500–3000) | 2600 (2600–2600) |
| Birth immunizations received, No. (%) | |||
| BCG | 1706 (84.4) | 1701 (84.5) | 5 (62.5) |
| OPV | 1705 (84.4) | 1700 (84.5) | 5 (62.5) |
Abbreviations: B. pertussis, Bordetella pertussis; IQR, interquartile range; OPV, oral polio vaccine; PCR, polymerase chain reaction.
a Specific to infants enrolled in the closed cohort (n = 221) only. Note that only 1 infant in the closed cohort had a positive PCR test for B. pertussis.