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Table 1 Characteristics of mothers and children in the intervention and the control group

From: Body mass index and physical activity in seven-year-old children whose mothers exercised during pregnancy: follow-up of a multicentre randomised controlled trial

  Intervention (n = 164) Control (n = 117)  
Mean (SD) Mean (SD) p value
Maternal characteristics at baseline
 Age, years 30.5 (3.9) 30.7 (4.2) 0.755
 Age > 40 years, n (%) 3 (1.8) 2 (1.7) 1.000
 Height, cm 168.8 (5.5) 168.3 (6.1) 0.447
 Weight, kg 69.4 (9.3) 69.6 (10.0) 0.863
 BMI, kg/m2 24.3 (2.8) 24.6 (3.2) 0.522
 Pre-pregnancy BMI ≥25 kg/m2, n (%) 29 (17.7) 20 (17.1) 0.898
 SES 4.0 (0.8) 4.1 (0.8) 0.502
 Exercise sessions per week 1.9 (1.4) 1.7 (1.4) 0.160
 Diabetes in near familya, n (%) 13 (8.3) 13 (12.4) 0.277
 Parity, n (%)
  0 96 (58.5) 63 (53.8)  
  1 51 (31.1) 38 (32.5) 0.369
  2 or more 17 (10.4) 16 (13.7)  
 Birth weight of previous child ≥4500 g, n (%) 3 (1.8) 1 (0.9) 0.643
Child characteristics at birth
 Gestational age, weeks 39.9 (1.7) 40.1 (1.3) 0.292
 Birth weight, g 3477 (608) 3580 (440) 0.102
 Lengthb, cm 49.7 (2.8) 50.2 (1.8) 0.154
 Head circumferencec, cm 34.9 (1.8) 35.3 (1.4) 0.047
 Male sex, n (%) 96 (58.5) 52 (44.4) 0.020
 Older siblings, n (%) 68 (41.5) 54 (46.2) 0.434
 Vaginal delivery, n (%) 143 (87.2) 104 (88.9) 0.668
 Prematurity, n (%) 7 (4.3) 3 (2.6) 0.530
 Admitted to NICUd, n (%) 6 (3.7) 1 (0.9) 0.245
Age at follow-up, years 7.4 (0.3) 7.4 (0.3) 0.294
  1. BMI body mass index, SES socioeconomic status (range 1–5, where 5 is highest), SD standard deviation, NICU neonatal intensive care unit
  2. aMissing data for seven mothers in the intervention group and 12 mothers in the control group
  3. bMissing data for five children in the intervention group and six children in the control group
  4. cMissing data for one child in the intervention group
  5. dMissing data for three children in the intervention group and two children in the control group