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Table 4 Postestimation tests for contrasts between the least (<HS, HS) and most (College+) educated women by race/ethnicity: CA, 2002–2004

From: Preterm birth among the hmong, other Asian subgroups and non-hispanic whites in California

  COMPARISON
  <HS vs. College+ HS vs. College+
  OR (Bonferroni 95 % CI) Bonferroni p-value OR Bonferroni 95 % CI) Bonferroni p-value
Mother’s race/ethnicity
Hmong 1.19 (0.60, 2.35) 1.000 1.18 (0.60, 2.31) 1.000
White 1.70 (1.56, 1.85) 0.000 1.32 (1.25, 1.40) 0.000
Chinese 1.33 (0.99, 1.80) 0.078 1.36 (1.09, 1.70) 0.000
Japanese 1.09 (0.18, 6.63) 1.000 1.60 (1.01, 2.54) 0.041
Korean 1.55 (0.38, 6.32) 1.000 1.44 (0.96, 2.17) 0.140
Asian Indian 1.48 (0.95, 2.29) 0.142 1.37 (1.04, 1.81) 0.011
Vietnamese 1.24 (0.96, 1.60) 0.205 1.11 (0.90, 1.36) 1.000
Cambodian 1.95 (1.07, 3.54) 0.014 1.96 (1.09, 3.52) 0.010
Filipino 1.47 (1.12, 1.92) 0.000 1.22 (1.04, 1.43) 0.003
Lao/Thai 1.74 (1.05, 2.90) 0.019 1.78 (1.14, 2.78) 0.002
  1. Notes. Postestimation tests were computed for a total of 20 contrasts between the two least educated groups (<HS, HS) and the most educated group (College+). Contrasts of marginal linear predictions were computed in Stata using the contrast command. P-values and 95 % confidence intervals were adjusted for multiple comparisons with the Bonferroni method using the mcompare option
  2. Notes. Statistically significant educational gradients of PTB were observed for white, Chinese (HS vs. College + only), Japanese (HS vs. College + only), Asian Indian (HS vs. College + only), Cambodian, Filipino, and Lao/Thai women. Predicted probabilities estimated from fully adjusted model, including interaction terms between maternal education and race/ethnicity