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Table 3 Antenatal and delivery characteristics of the 2,032 a public and private deliveries that were individually matched on the propensity score of maternal demographics

From: Neonatal outcomes after preterm birth by mothers’ health insurance status at birth: a retrospective cohort study

  Publicly insured women Privately insured women Degrees of  
  (n = 1,016) (n = 1,016) freedom p-valueb
Antenatal risk factors n (%) n (%)   
Threatened abortion (<20 weeks) 63 (6.2) 96 (9.5) 1 0.006
Threatened preterm labour (<37w) 157 (15.5) 116 (11.4) 1 0.008
Urinary tract infection 41 (4.0) 28 (2.8) 1 0.11
Pre-eclampsia 76 (7.5) 153 (15.1) 1 <0.0001
Placenta praevia 15 (1.5) 40 (3.9) 1 0.0006
Placental abruption 24 (2.4) 23 (2.3) 1 0.88
Pre-labour rupture of membranes 259 (25.5) 183 (18.0) 1 <0.0001
Gestational diabetes 63 (6.2) 48 (4.7) 1 0.14
Gestation (weeks)     
 32 9 (0.9) 21 (2.1)   
 33 13 (1.3) 30 (3.0)   
 34 43 (4.2) 145 (14.3)   
 35 206 (20.3) 231 (22.7)   
 36 745 (73.3) 589 (58.0) 4 <0.0001
Mode of delivery     
 Unassisted vaginal 551 (54.2) 358 (35.2)   
 Assisted vaginal 114 (11.2) 142 (14.0)   
 Caesarean section in labour 196 (19.3) 192 (18.9)   
 Pre-labour caesarean section 155 (15.3) 324 (31.9) 3 <0.0001
  Mean (±SD) Mean (±SD)   
Infant weight (g) 2,764.6 (471.1) 2,687.4 (471.1)   0.0002
  1. a Restricted to singleton, pre-term births (32–36 weeks), in non-tertiary hospitals, resulting in live-born infants without birth defects.
  2. b ttest for means and Chi square test of independence for proportions.
  3. c Only deliveries with labour.