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Table 4 Demographics of enrolled PROP multicenter cohort

From: Prematurity and respiratory outcomes program (PROP): study protocol of a prospective multicenter study of respiratory outcomes of preterm infants in the United States

  Enrolled a (N = 835)
Birth weight, grams (mean +/− SD) 900 +/− 240
Gestational age, weeks (mean +/− SD) 26.6 +/− 1.5
- 23 weeks, 0–6 days 34 (4%)
- 24 weeks, 0–6 days 108 (13%)
- 25 weeks, 0–6 days 129 (15%)
- 26 weeks, 0–6 days 170 (20%)
- 27 weeks, 0–6 days 201 (24%)
- 28 weeks, 0–6 days 193 (23%)
Multiple gestation 210 (25.1%)
- Twins 171 (81%)
- Triplets 35 (17%)
- Quadruplets 4 (2%)
Male 427 (51%)
Race b  
- Caucasian 486 (58.2%)
- African American 307 (36.8%)
- N. American Indian/Native Alaskan 1 (0.1%)
- Asian 20 (2.4%)
- Native Hawaiian/other Pacific islander 1 (0.1%)
- Multi-race 15 (1.8%)
- Other 5 (0.6%)
Ethnicity b  
- Hispanic/Latino 92 (11%)
Inborn 728 (87.2%)
Outborn 105 (12.6%)
  1. aPercentages may not add to 100 percent due to missing data for two babies who were withdrawn four days after enrollment.
  2. bRace and ethnicity uses a mutually exclusive definition.