Table 1. Baseline characteristics of vaccinated and unvaccinated mothers [33].

	Vaccine recipients (n = 77)	Unvaccinated (n = 27))	p
Maternal age, y	31 (29–32)	29 (26–31)	0.1413
Ethnic origin
White	67 (89)	25 (93)	0.6253
Other	8 (11)	2 (7)
Pregnancy status
1	35 (46)	10 (37)	0.4172
2 or more	41 (54)	17 (63)
Childbirth status
0	45 (59)	16 (59)	0.9965
1 or more	31 (41)	11 (41)
No. of co-morbidities
0	67 (87)	22 (81)	0.4815
1 or more	10 (13)	5 (19)
Previous obstetric problems
0	50 (65)	16 (59)	0.5982
1 or more	27 (35)	11 (41)
Mode of delivery
Normal, assisted, elective or caesarean unspecified	67 (88)	22 (88)	0.9831
Emergency caesarean section	9 (12)	3 (12)
Sex of child
Male	38 (50)	16 (59)	0.4079
Birthweight, grams	3365 (3223–3507)	3600 (3400–3799)	0.0848
Gestational age, weeks	39.3 (38.9–39.7)	40.1 (39.5–40.7)	0.0612
No. of under 5-y-olds at home
0	43 (57)	17 (63)	0.6103
1 or more	32 (43)	10 (37)
No. of smokers in household
0	54 (82)	16 (70)	0.2169
1 or more	12 (18)	7 (30)

Data are means for: years/birth weight/gestational age (95% confidence interval) or number (%) for all other parameters.