Table 2

Adjusted odds ratios for risk of PTB by demographic and perinatal characteristics, New Mexico, 1991-2005
Adjusted Odds Ratio 95% Confidence Interval p value
Maternal Age
Reference age = 25-29
 Age Group
  <15 1.9 1.47-2.46 <0.0001
  15-19 1.22 1.15-1.30 <0.0001
  20-24 1.07 1.02-1.13 0.0059
  30-34 1.09 1.03-1.15 0.0037
  35-39 1.25 1.17-1.35 <0.0001
  >40 1.34 1.18-1.52 <0.0001
Maternal Education Level
Reference education level = 9-12 years
 Number of years
  <9 0.995 0.92-1.07 0.91
  13-16 0.89 0.85-0.93 <0.0001
  >16 0.82 0.76-0.89 <0.0001
Maternal Ethnicity
Reference ethnicity = White Non-Hispanic
  Asian 1.23 1.05-1.43 0.0087
  Other 1.49 0.76-2.92 0.2452
  White Hispanic 1.05 1.00-1.10 0.0372
  Native American 0.88 0.82-0.95 0.0016
  Black 1.37 1.22-1.54 <0.0001
Normal Risk Pregnancy and Level of Prenatal Care
Reference level of care = Kotelchuck adequate
 Kotelchuck Index
  None 4.92 4.53-5.34 <0.0001
  Inadequate 2.16 2.02-2.30 <0.0001
  Intermediate 0.93 0.85-1.01 0.0728
  High 4.95 4.66-5.25 <0.0001
High Risk Pregnancy and Level of Prenatal Care
 Kotelchuck Index
  None 14.66 12.92-16.64 <0.0001
  Inadequate 4.78 4.34-5.26 <0.0001
  Intermediate 2.59 2.26-2.97 <0.0001
  Adequate 2.31 2.08-2.56 <0.0001
  High 8.42 7.83-9.05 <0.0001

Gwin et al.

Gwin et al. BMC Pregnancy and Childbirth 2012 12:53   doi:10.1186/1471-2393-12-53

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