TABLE 1.

Cognitive Measures at 3 or 5 Years of Age

Full-Term SiblingsELBWMean Difference (95% CI)P Value
N = 25N = 25
SB IQ, mean ± SD95 ± 1185 ± 129.7 (3.1, 16.3).005
 <6801 (4%).96
 68–837 (28%)11 (44%).37
Subtests
 Verbal reasoning100 ± 1392 ± 148.4 (0.6, 16.2).03
 Abstract visual reasoning92 ± 1179 ± 1112.7 (6.3, 19.3).000
 Quantitative reasoning98 ± 1193 ± 105.2 (−0.7, 11.2).085
 Short-term memory91 ± 1186 ± 135.4 (−1.6, 12.5).12
Wide Range Achievement Test*N = 23N = 22
 Reading87 ± 981 ± 135.6 (−1.1, 12.3).097
 Spelling84 ± 1869 ± 1815.3 (4.4, 26.3).007
 Arithmetic81 ± 1774 ± 157.2 (−2.4, 17.2).16
Goodenough-Harris Drawing Test*N = 23N = 20
88 ± 1477 ± 1310.0 (1.5, 18.6).023
  • * Five-year testing only (possible N = 23).