Table 1. Baseline characteristics of the study groups.

	All	Caucasian	Afrocaribbean	P value
	n = 541	n = 229	n = 216
Age (years)	30.38 (6.12)	31.0 (6.2)	30.4 (6.0)	0.30
BMI (kg/m2)	26.84 (4.98)	26.4 (4.6)	27.7 (5.2)	0.004
Nulliparity n (%)	242 (44.8)	115 (50.4%)	85 (39.4%)	0.024
Smokers n (%)	78 (14.4)	31.0 (6.2)	30.4 (6.0)	0.30

BMI = body mass index.

Data are expressed as means±SD or as percentages.

P values indicate the difference between the two ethnic groups.