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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: Am J Obstet Gynecol. 2013 Mar 15;209(1):51.e1–51.e6. doi: 10.1016/j.ajog.2013.03.011

Table 1.

Distribution of demographic characteristics and potential risk factors (N=1798)

Characteristic or Factor Prevalence– n (%)

Maternal Age (years) 24.1±5.4

Oxytocin Dose
  10U 659 (37%)
  40U 481 (27%)
  80U 658 (37%)

Nulliparity 673 (37%)

  Hispanic 327 (18%)
  White & Other 410 (23%)
  Black 1061 (59%)

  Obese (BMI≥30) 1036 (58%)
  Overweight (BMI 25–30) 523 (29%)
  Normal, Underweight 239 (13%)

  Augmentation 955 (53%)
  Induction 572 (32%)
  Spontaneous 271 (15%)

Preeclampsia/Eclampsia 218 (12%)

MgSO4 Use 188 (10%)

Twins 13 (<1%)

Chorioamnionitis 122 (7%)

Hydramnios 43 (2%)

Amnioinfusion 299 (17%)

Epidural anesthesia 1504 (84%)

Breastfeeding 1000 (57%)

Spontaneous ROM 584 (33%)

Prior Cesarean 86 (5%)

Operative Deliveries 147 (8%)

Anemia 44 (2%)

Protracted 2nd Stage 108 (6%)

Prolonged 3rd Stage 35 (2%)

GA at delivery a weeks 38.8±2.1

Total birthweight
  <2500g 190 (11%)
  2500g –3999g 1499 (83%)
  >=4000g 109 (6%)

GA at delivery
  <37 weeks 223 (12%)
  37–41 weeks 1395 (78%)
  ≥41 weeks 180 (10%)
a

mean ± standard deviation