Reduced growth velocity across the third trimester is associated with placental insufficiency in fetuses born at a normal birthweight: a prospective cohort study

Table 2 Assessment for recruitment bias – demographic and delivery characteristics of recruited participants compared to eligible women who were not recruited

	Recruited (n = 365)	Not recruited (n = 244)	P
Age, years	30.9 (4.1)	31.6 (4.2)	0.05
Booking BMI, kg/m²	23.7 (21.5–26.9)	23.5 (21.5–26.2)	0.26
Smoking status
Current smoker Ex-smoker Never	7 (1.9%) 95 (26.1%) 262 (72.0%)	7 (2.9%) 51 (20.9%) 186 (76.2%)	0.28
Gestational hypertension or pre-eclampsia	53 (14.6%)	42 (17.3%)	0.37
GDM	47 (12.9%)	26 (10.7%)	0.45
Onset of delivery
Induction of labour Spontaneous labour No labour	177 (48.6%) 155 (42.6%) 32 (8.8%)	104 (42.8%) 117 (48.1%) 22 (9.1%)	0.35
Mode of delivery
Normal vaginal delivery Instrumental delivery Emergency caesarean Elective caesarean	137 (37.6%) 118 (32.4%) 80 (22.0%) 29 (8.0%)	90 (37.0%) 76 (31.3%) 58 (23.9%) 19 (7.8%)	0.96
Birthweight, g	3331 (514.5)	3308 (526.0)	0.87
Birthweight centile	39.0 (18.1–69.6)	40.6 (20.8–64.9)	0.83
SGA, < 10th centile	45 (12.4%)^a	28 (11.5%)	0.80
Severe SGA, < 3rd centile	13 (3.6%)^a	9 (3.7%)	1.00
Gestational age at delivery, weeks	39.7 (38.7–40.6)	39.7 (38.7–40.6)	0.80

Data presented as mean (standard deviation) or median (interquartile range) depending on distribution for continuous variables, and as number (%) for categorical variables
BMI body mass index, GDM gestational diabetes mellitus, SGA small-for-gestational-age
^aThe 45 cases where SGA (customised birthweight < 10th centile) infants were delivered were excluded from the final analysis

ISSN: 1741-7015