TABLE 1.

Sociodemographic Characteristics of Mothers and Their Infants

CharacteristicNo. of Subjects (%)
Infant gender*
    Male92 (47.9)
    Female100 (52.1)
Infant race
    White106 (56.1)
    Black57 (30.2)
    Biracial19 (12.7)
    Asian5 (2.6)
    Hispanic2 (1.1)
Maternal age
    ≤19 y20 (10.6)
    20–29 y112 (59.2)
    ≥30 y57 (30.2)
Birth order
    First born60 (31.7)
    Second born63 (33.3)
    Later born66 (34.9)
Maternal employment (at 6 mo)
    Employed100 (68.0)
    Unemployed47 (32.0)
  • * Includes 2 sets of male-female twins and 1 set of male-male twins.