TABLE 1

Weighted Demographic Characteristics of Study Population

N (%)Weighted, %US Vital Statistics (2011/2012)20
Maternal age, y
 14–1981 (7.9)7.68.1
 20–29569 (55.2)52.951.8
 ≥30381 (37.0)39.540.1
Maternal education
 < High school152 (14.8)14.117.8
 High school/high school equivalent240 (23.3)22.025.1
 Some college315 (30.6)27.328.8
 ≥ College degree323 (31.4)36.628.3
Parity
 1389 (37.8)37.139.8
 ≥2641 (62.2)62.959.6
Maternal race/ethnicity
 White407 (39.5)53.854.1
 Black252 (24.4)12.614.7
 Hispanic300 (29.1)26.823.1
 Other72 (7.1)6.97.3
Income
 <$20 000397 (38.5)31.7NA
 $20 000–$49 999274 (26.6)27.2NA
 ≥$50 000184 (17.9)21.1NA
 Unknown175 (17.0)20.1NA
Region
 Northeast193 (18.7)22.316.2
 Midwest158 (15.3)13.621.1
 South409 (39.7)40.038.1
 West271 (26.3)24.224.6
Infant age, wk
 8–11543 (52.6)55.2a
 12–15230 (22.3)21.9a
 16–19121 (11.7)10.8a
 ≥20138 (13.4)12.1a
Infant gender
 Girl498 (48.2)47.748.8
 Boy534 (51.7)52.351.2
Infant birth weight, g
 <250056 (5.5)5.08.0
 ≥2500970 (94.5)95.091.9
  • NA, not available.

  • a US Vital Statistics Data not applicable to infant age at time of survey response.