TABLE 5

Estimates of NDE, NIE, and Total Effect of the Association Between ART and Subfertility and EI Enrollment Mediated Through Preterm Birth: Massachusetts Singleton Births, July 1, 2004, to December 31, 2008

NDENIETotal Effect
ORa (95% CI)PORa (95% CI)POR (95% CI)P
ART versus Fertile1.27 (1.19 ̶ 1.36)<.0011.03 (1.02 ̶ 1.04)<.0011.31 (1.22 ̶ 1.40)<.001
Subfertile versus Fertile1.20 (1.12 ̶ 1.29)<.0011.01 (1.00 ̶ 1.01)<.011.21 (1.12 ̶ 1.30)<.001
  • a Models adjusted for maternal age, race, education, marital status, nativity, delivery payer source, smoking, prenatal care, parity, gender, labor and delivery complications, and abnormal conditions of the newborn. An interaction term was included for the ART versus Fertile comparison.