Table 4.

Characteristics of mother infant pairs according to colonisation status at birth.

	Total	M+I+	M+I−	M−I+	M−I−	p-value
Maternal age						0.96
<20	110	23	17	2	68
20–24	262	43	38	19	162
25–29	203	46	25	11	121
30+	175	34	27	8	106
Ethnicity						0.10
Mandinka	315	63	52	23	177
Wolof	108	23	13	8	64
Fula	126	28	17	2	79
Jola	118	21	12	3	82
Other	81	11	12	4	54
Missing	2	0	1	0	1
Maternal weight (kg)						0.04*
<50	27	2	5	4	16
50–70	424	74	54	21	275
70–90	148	36	25	3	84
90+	145	32	23	9	81
Missing	6	3	0	3	0
Mother ill						0.48
Yes	128	24	21	3	80
No	504	97	68	25	314
Missing	118	25	18	12	63
Maternal Hb <10 g/dL						0.11
No	99	24	18	2	55
Yes	651	122	89	33	403
Maternal antibiotics in pregnancy
No	505	99	92	0	314	0.91
Yes	128	23	24	0	81
Gravida						0.44
1	208	39	28	13	128
2–4	370	67	54	17	232
5+	169	39	25	10	95
Missing	3	1	0	0	2
Parity						0.94
0–1	212	39	29	13	131
2–4	468	96	68	24	280
5+	67	10	10	3	44
Missing	3	1	0	0	2
Living children						0.66
0	230	43	37	14	136
1–4	465	94	61	25	285
5+	53	7	9	1	36
Missing	2	2	0	0	0
Spontaneous abortion						0.09
0	649	121	92	31	405
1	53	14	6	4	29
2+	14	7	1	0	6
Missing	34	11	0	5	18
Stillbirths						0.03*
0	641	119	87	32	403
1	75	20	9	6	40
2+	28	5	10	2	11
Missing	6	2	1	0	3
Number of ANC visits						0.002*
1	303	58	27	15	203
2+	447	88	80	25	254
Midwife delivery	436	108	60	20	248	<0.001*
TBA	254	29	38	12	175
Missing	60	9	9	8	34
Infant sex						0.71
Male	369	72	50	23	224
Female	381	74	57	17	233
Season						<0.001*
Dry cool	280	22	33	17	208
Dry hot	175	66	19	3	87
Wet	295	58	55	20	162
Birth weight (kg)						0.02*
2.5–3	260	44	29	20	167
3.1–4	464	95	74	18	277
>4.0	26	7	4	2	13
Gestation (weeks)						0.04*
<34	56	13	5	4	34
34–37	231	57	26	12	136
38+	463	76	76	24	287
Breastmilk colonised						<0.001*
Yes	64	31	18	7	8
No	600	101	77	31	391
Missing	86	14	12	2	58

M+I+ = mother and infant colonised; M+I− = mother colonised, infant not colonised; M−I+ = mother not colonised, infant colonised, M−I− = neither mother nor infant colonised; TBA = trained birth attendant; ANC = antenatal clinic.