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Table 2 Characteristics of the participants by parity

From: Pregnant women’s clinical characteristics, intrapartum interventions, and duration of labour in urban China: a multi-center cross-sectional study

Characteristics Total (N = 1209) Nullipara (n = 841) Multipara (n = 368) Statistic P value
Age (years), n (%)     191.721a <.001
 20-24y 78 (6.5) 57 (6.8) 21 (5.7)   
 25-29y 533 (44.1) 462 (54.9) 71 (19.3)   
 30-34y 456 (37.7) 276 (32.8) 180 (48.9)   
 35-39y 119 (9.8) 44 (5.2) 75 (20.4)   
  ≥ 40y 23 (1.9) 2 (0.2) 21 (5.7)   
Educational level, n (%)     9.067a 0.028
 Junior high school or below 162 (13.4) 102 (12.1) 60 (16.3)   
 Senior high/ technical school 250 (20.7) 169 (20.1) 81 (22.0)   
 College graduate 597 (49.4) 438 (52.1) 159 (43.2)   
 Postgraduate 200 (16.5) 132 (15.7) 68 (18.5)   
Household monthly income per capita, CNY, n (%)     0.605a 0.895
  < 5000 95 (7.9) 69 (8.2) 26 (7.1)   
 5000-7999 239 (19.8) 168 (20.0) 71 (19.3)   
 8000-10,000 279 (23.1) 193 (22.9) 86 (23.4)   
  > 10,000 596 (49.3) 411 (48.9) 185 (50.3)   
 Gestational weeks, mean (SD) 39.56 (1.02) 39.66 (1.02) 39.34 (1.01) 5.159b 0.762
Prepregnancy weight category, n (%)     7.536a 0.057
 Underweight (BMI < 18.5 kg/m2) 226 (18.7) 146 (17.4) 80 (21.7)   
 Normal weight (BMI 18.5–24.9 kg/m2) 875 (72.4) 613 (72.9) 262 (71.2)   
 Overweight (BMI 25.0–29.9 kg/m2) 100 (8.3) 78 (9.3) 22 (6.0)   
 Obese (BMI ≥ 30.0 kg/m2) 8 (0.7) 4 (0.5) 4 (1.1)   
GWG, n (%)     6.665a 0.036
 Inadequate GWG (1)(4)(7)(10)c 254 (21.0) 175 (20.8) 79 (21.5)   
 Adequate GWG (2)(5)(8)(11)c 589 (48.7) 393 (46.7) 196 (53.3)   
 Excessive GWG (3)(6)(9)(12)c 366 (30.3) 273 (32.5) 93 (25.3)   
  1. CNY Chinese Yuan; BMI Body mass index; GWG Gestational weight gain
  2. a Chi-square test; bt test;
  3. c Numbers in parentheses indicate number for category of gestational weight gain listed in Table 1