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Table 1 Clinical and demographic characteristics of the study population

From: The vaginal microbiota of pregnant women who subsequently have spontaneous preterm labor and delivery and those with a normal delivery at term

  Term delivery (n = 72) Spontaneous preterm delivery (n = 18) P value
Age (years) 24 (21.8-28) 21 (20–26) 0.1
Race:    
  African American 62 (86.1%) 17 (94.4%) 0.7
  White 4 (5.6%) 1 (5.6%)  
  Others 6 (8.3%) 0  
Pre-pregnancy BMI (kg/m2) 28.7 (25.7-35.3)* 25.7 (21.6-33.6)** 0.2
Nulliparity 18 (25%) 7 (38.9%) 0.3
Gestational age at delivery (weeks) 39.6 (38.8-40.7) 30.5 (28–33.1) 0.001
Birthweight (grams) 3295 (3124.3-3538.8) 1402.5 (997.5-1998.8) 0.001
Apgar score at 1 min 9 (8–9) 6 (3–8) 0.001
Apgar score at 5 min 9 (9–9) 8 (6–8) 0.001
Duration of hospital stay (neonates); in days 3 (3–3)** 26 (13–53)*** 0.001
  1. Data presented as median (interquartile range) or n (%).
  2. BMI: body mass index.
  3. Missing data: *n = 4, **n = 6, ***n = 1.