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

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

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