TABLE 2

Study Cohort Characteristics

Pre-SRC (n = 5692)Post-SRC (n = 6090)P
Girls, n (%)2721 (47.8)2998 (49.2).12
GA at birth, mean (SD)39.4 (1.2)39.3 (1.3).005
GA 36 0/7–37 0/7 wk, n (%)192 (3.4)261 (4.3).01
BW <2500 g, n (%)210 (3.7)257 (4.2).14
Apgar score ≤5 at 5 mina34 (0.6)28 (0.5).30
Vaginal delivery, n (%)3819 (67.1)4263 (70.0).001
Multiple gestation, n (%)158 (2.8)184 (3.0).43
Race and/or ethnicity, n (%)
 White2602 (45.7)2962 (48.6)<.001
 African American1668 (29.3)1786 (29.3)
 Hispanic616 (10.8)674 (11.1)
 Other777 (13.7)654 (10.7)
 Unknown or missing29 (0.5)14 (0.2)
NICU admissions, n (%)719 (12.6)732 (12.0).31
  • BW, birth weight; GA, gestational age.

  • a Twenty-two infants in pre-SRC period and 2 infants in the post-SRC period had missing data.