TABLE 1

Characteristics of Matched Case Patients and Controls for Infant Hospitalizations and Mortality in the First 6 Months of Life in the VSD, 2004–2014

Hospitalization Case Patients (n = 25 222)Matched Controls (n = 25 222)PaDeath Case Patients (n = 157)Matched Controls (n = 157)P
Mean age at event in d (range)36 (1–183)61 (1–180)
Mean gestational age at delivery in wk (range)39 (34–43)39 (34–43)<.000139 (34–41)39 (34–41).88
Mean maternal age in y (range)31 (13–54)31 (13–55).000530 (15–41)30 (16–41).23
Mean length of delivery hospitalization in d (range)2.2 (0–103)2.2 (0–110)<.00013.5 (0–41)2.2 (0–18).43
Smoking during pregnancy, %8.99.2.391510.35
Pregnancy complications, %b31.028.7<.00013427.14
Cesarean delivery, %23.627.9<.00013631.52
Adequate prenatal care by Kotelchuck index, %3194.293.9.309292.92
African American non-Hispanic or American Indian race, %5.97.2<.0001106.14
  • —, not applicable.

  • a P values calculated by χ2 tests for categorical variables and Wilcoxon median 2-sample tests for continuous variables.

  • b Pregnancy complications include hemorrhage, hypertensive disorders, renal disease, diabetes, thyroid disease, cardiovascular disease, and epilepsy.