TABLE 2

Gestational Length (Term Versus Late Preterm) and Its Unadjusted/Adjusted Association With Child IQ (Age 6)

TermLate PretermMean Difference: Term to Late Preterm (95% CI)aUnadjusted OR (95% CI)aOR (95% CI)b
Child IQ (continuous), mean (SE)
    FSIQ
        Unadjusted101.94 (1.27)100.58 (1.27)1.36 (−2.19 to 4.91)
        Adjusted102.03 (1.11)100.72 (1.10)1.31 (−1.67 to 4.29)
    VIQ
        Unadjusted101.95 (1.31)101.74 (1.31).20 (−3.44 to 3.85)
        Adjusted102.25 (1.55)102.10 (1.13).15 (−2.91 to 3.21)
    PIQ
        Unadjusted101.67 (1.22)99.11 (1.22)2.56 (−0.78 to 5.90)
        Adjusted101.53 (1.12)99.04 (1.11)2.49 (−0.53 to 5.51)d
Child IQ (categorical), N (%)
    FSIQ
        <8520 (12)35 (21)2.17 (1.17 to 4.03)c2.35 (1.20 to 4.61)c
        85–115 (ref)113 (67)91 (54)
        >11535 (21)42 (25)1.49 (0.88 to 2.53)1.46 (0.82 to 2.60)
    VIQ
        <8523 (14)29 (17)1.47 (0.80 to 2.72)1.52 (0.78 to 2.95)
        85–115 (ref)111 (66)95 (57)
        >11534 (20)44 (26)1.55 (0.90 to 2.69)1.66 (0.92 to 3.01)
    PIQ
        <8522 (13)37 (22)2.01 (1.10 to 3.68)c2.04 (1.09 to 3.82)c
        85–115 (ref)114 (68)96 (57)
        >11532 (19)35 (21)1.30 (0.75 to 2.26)1.22 (0.67 to 2.22)
  • a Linear mixed model adjusted for residential setting, maternal IQ, maternal education, marital status, and child sex.

  • b Multinomial model adjusted for residential setting, maternal IQ, maternal education, marital status, and child sex.

  • c P < .05.

  • d P < .10.