Table 6.

Single variable analysis of infant GBS colonisation dynamics over time compared to birth.

		Birth OR (95% CI)	Day 6	Day 60–89
		OR (95% CI)	OR (95% CI)
Mother GBS colonised at delivery
Birth season	Dry cool	1	0.2 (0.1–0.6)	0.1 (0.0–0.4)
Dry hot	4.6 (2.2–9.7)	1.9 (1.0–4.1)	0.6 (0.2–1.3)
Wet	1.4 (0.7–2.8)	0.7 (0.3–1.5)	0.3 (0.1–0.7)
Living children	0	1	0.5 (0.3–0.9)	0.2 (0.1–0.4)
1–4	0.9 (0.5–1.6)	0.4 (0.2–0.7)	0.1 (0.0–0.3)
5+	0.9 (0.3–2.6)	0.6 (0.2–1.8)	0.2 (0.0–0.9)
Gestation at birth (wks.)	<34	1	0.4 (0.1–1.4)	ND
34–37	0.9 (0.3–2.4)	0.3 (0.1–0.9)	0.2 (0.1–0.7)
38+	0.4 (0.1–1.0)	0.2 (0.1–0.5)	0.0 (0.0–0.1)
Infant weight (kg)	2.5–3	1	0.5 (0.2–1.0)	0.1 (0.0–0.3)
3.1–4.0	1.2 (0.4–3.8)	0.7 (0.3–0.9)	0.1 (0.1–0.3)
>4.0	0.6 (0.1–2.3)	0.3 (0.1–0.7)	0.1 (0.0–0.6)
BM colonised	Yes	0.9 (0.5–1.7)	0.4 (0.2–0.8)	0.3 (0.1–0.7)
No	1	0.4 (0.3–0.6)	0.1 (0.1–0.2)
Infant sex	Male	1	0.4 (0.3–0.7)	0.1 (0.1–0.3)
	Female	0.7 (0.4–1.2)	0.4 (0.2–0.6)	0.1 (0.1–0.3)
Mother not GBS colonised at delivery
Birth season	Dry cool	1	1.4 (0.5–4.3)	0.8 (0.2–2.8)
Dry hot	1	1.3 (0.3–5.3)	4.7 (1.7–13.5)
Wet	2.1 (0.8–6.0)	4.1 (1.6–10.5)	0.2 (0.0–1.9)
Living children	0	1	1.8 (0.5–5.7)	1.7 (0.5–5.6)
1–4	1.0 (0.3–2.9)	2.2 (0.8–5.9)	0.7 (0.2–2.3)
5+	2.0 (0.1–7.1)	1	0.8 (0.1–7.3)
Gestation at birth (wks.)	<34	1	3.3 (0.3–34.4)	1
34–37	1.6 (0.2–13.4)	2.5 (0.3–20.6)	1.4 (0.2–13.0)
38+	1.1 (0.1–9.0)	2.2 (0.3–17.3)	1.3 (0.2–10.8)
Infant weight (kg)	2.5–3.0	1	1.2 (0.4–3.8)	0.6 (0.1–2.3)
3.1–4.0	0.5 (0.2–1.4)	1.2 (0.5–2.9)	0.6 (0.2–1.7)
>4.0	0.9 (0.2–2.3)	1.7 (0.9–4.9)	0.4 (0.3–2.2)
BM colonised	Yes	14.2 (4.0–50.8)	6.9 (2.5–19.1)	3.3 (1.2–11.0)
No	1	2.0 (0.9–4.2)	1.0 (0.4–2.5)
Infant sex	Male	1	1.4 (0.6–3.1)	0.8 (0.3–2.0)
	Female	0.3 (0.1–1.0)	1.1 (0.5–2.5)	0.5 (0.2–1.5)