Independent and Joint Risk for Infant Morbidity During Birth Hospitalization According to Gestational Age Group and Exposure to Selected Maternal Medical Conditions: Massachusetts, 1998–2003

Maternal Medical Conditions According to GestationalAge GroupNo. of Infants (N = 403 808)Proportion With Newborn MorbidityRR
n%cRRaRRa95% CI
Term377 63811 3213.01.01.0
Late preterm26 170579922.–7.1
        No351 75699762.81.01.0
        Yes25 88213455.–1.9
    Late preterm
        No22 290454020.–6.9
        No359 98010 4312.91.01.0
        Yes17 6588905.–1.8
    Late preterm
        No24 178523421.–7.2
Antepartum hemorrhage
        No371 28010 8872.91.01.0
    Late preterm
        No24 370514121.–6.9
Acute or chronic lung disease
        No361 82610 5432.91.01.0
        Yes15 8127784.–1.7
    Late preterm
        No24 583532021.–7.2
Maternal infection
        No361 41810 3092.81.01.0
        Yes16 22010126.–2.2
    Late preterm
        No25 233554222.–7.4
Cardiac disease
        No370 72911 0203.01.01.0
    Late preterm
        No25 60456522.–7.2
Renal disease
        No375 91811 1943.01.01.0
    Late preterm
        No25 912571122.–7.1
Genital herpes
        No376 85611 2933.01.01.0
    Late preterm
        No26 134578622.–7.1
  • Reference category in each model is term infant without the maternal condition.

  • a aRR in separate models for each maternal medical condition controlling for maternal age, maternal education, parity, race/ethnicity, gender, insurance type at delivery, and cigarette smoking during pregnancy.

  • b Chronic hypertension and pregnancy-related hypertension.

  • c Gestational and established.