Skip to main content

Table 1 Characteristics of the study population

From: The effects of pre-pregnancy body mass index and gestational weight gain on perinatal outcomes in Korean women: a retrospective cohort study

  Underweight (BMI < 18.5) Normal (18.5 ≤ BMI < 23) Overweight (23 ≤ BMI < 25) Obese (25 ≤ BMI) p-value
N 417 (17.3) 1556 (64.5) 236 (9.8) 204 (8.5)  
Agea 31.3 ± 3.6 32.3 ± 3.9 33.4 ± 4.1 33.3 ± 3.9 < 0.0001
Educational statusb
Under middle school
High school
College or higher
1 (0.2)
43 (10.3)
373 (89.5)
7 (0.5)
160 (10.3)
1389 (89.3)
1 (0.4)
40 (17.0)
195 (82.6)
1 (0.5)
39 (19.1)
164 (80.4)
0.0014
Occupationb 191 (45.8) 779 (50.1) 106 (44.9) 70 (34.3) 0.0002
Medical historyb 43 (10.3) 153 (9.8) 25 (10.6) 32 (15.7) 0.0857
Parityb (multigravida) 129 (30.9) 623 (40.0) 135 (57.2) 109 (53.4) < 0.0001
Length of gestationa (weeks) 38.7 ± 2.7 38.7 ± 2.7 38.2 ± 3.3 37.7 ± 3.8 < 0.0001
Mode of deliveryb
Vaginal delivery
Cesarean section
291 (69.8)
126 (30.2)
1024 (65.8)
532 (34.2)
128 (54.2)
108 (45.8)
89 (45.6)
115 (56.4)
< 0.0001
Weight gaina (kg) 13.4 ± 4.2 13.4 ± 4.2 12.31 ± 4.91 11.0 ± 5.2 < 0.0001
Weight of fetusa (g) 3033.5
± 584.0
3122.7
± 603.0
3109.4
± 740.2
3069.3
± 856.1
0.0728
Maternal complicationsb 50(12.0) 226(14.5) 52(22.0) 68(33.3) < 0.0001
Neonatal complicationsb 137(32.9) 444(28.5) 81(34.3) 74(36.3) < 0.0001
  1. a Based on ANOVA (mean ± SD)
  2. b Based on chi-square or Fisher's exact test (count, %)
  3. BMI, body mass index; SD, standard deviation