TABLE 1

Characteristics of Late Preterm and Term Matched Pairs

Term (N = 168)Late Preterm (N = 168)P
Categorical variable, n (%)
    Maternal racea
        White81 (48)84 (50).74
        Black87 (52)84 (50)
    Residenceb
        Urban95 (57)93 (55).83
        Suburban73 (43)75 (45)
    Maternal educationa
        Less than high school31 (18)38 (23).77
        High school48 (29)42 (25)
        Some college63 (38)63 (38)
        ≥4 y of college26 (15)25 (14)
    Marital statusa
        Unmarried76 (45)78 (46).83
        Married92 (55)90 (54)
    Child sex
        Male83 (49)91 (54).51
        Female85 (51)77 (46)
    Gestational age at delivery, wk
        3446 (28)
        3549 (29)
        3673 (43)
        3729 (17)
        3824 (14)
        3934 (20)
        4060 (36)
        4121 (13)
Continuous variables, mean (SD)
    Birth weight z score−0.90 (0.84)−0.90 (0.84).98
    Maternal IQc92.54 (14.47)92.77 (14.93).88
  • a Obtained at child's age-6 assessment via maternal report.

  • b Based on zip code at child's age-6 assessment.

  • c Estimated at child's age-6 assessment via administration of the block design and vocabulary subscales of the Wechsler Adult Intelligence Scale-Revised.