TABLE 3

Cognitive Developmental Score After the Age of 12 Months per Time Point

Age at Testing, mo, Median (IQR)GMDS: DQ (Without Locomotor Subscore), Median (IQR)BSITD-III: Cognitive Composite Score, Median (IQR)WPPSI: Total IQ Score, Median (IQR)z Score, Median (IQR)z Score <1 SD, n (%)
12–18 mo, n = 8315.2 (13.0 to 17.6)98.2 (92.2 to 110.0)−0.15 (−0.65 to 0.83)15 (18)
∼2 y, n = 123a24.0 (21.1 to 25.0)98.5 (91.1 to 104.7)105.0 (95.0 to 113.8)−0.03 (−0.67 to 0.67)b17 (13)
∼3–4 y, n = 7141.1 (36.0 to 42.4)98.9 (88.6 to 107.5)−0.09 (−0.95 to 0.64)14 (19)
∼5–7 y, n = 6467.0 (65.0 to 70.0)102.0 (88.0 to 111.0)0.10 (−0.80 to 0.73)11 (17)
Latest follow-up, n = 16041.7 (24.6 to 66.0)−0.04c (−0.95 to 0.68)37 (23)
  • DQ, developmental quotient; WPPSI, Wechsler Preschool and Primary Scale of Intelligence; —, not applicable.

  • a At ∼2 y, 106 tested with the GMDS, and 28 tested with the BSITD-III.

  • b When tested with both GMDS and BSITD-III, a z score was calculated for the latest test.

  • c z score could not be calculated in 3 infants because of severe delay (<−2 SD).