Table 3.

Birth Weight and Neuropsychological Performance in Case Subjects^a

Domain/Measure	Parameter Estimate	Parameter 95% CI	P Value from GLM
Executive function
Composite score	0.096 b	0.016 to 0.177	.019
Wisconsin Card Sort Test
Total errors	−0.022 b	−0.028 to −0.015	<.001
Perseverative errors	−0.016 b	−0.025 to −0.007	<.001
Nonperseverative errors	−0.027 b	−0.036 to −0.018	<.001
Trail Making Test
Trails A time	0.0000	−0.0002 to 0.0002	.778
Trails B time	0.0001 b	0.0000 to 0.0002	<.001
Trails B regressed on Trails A	−0.628 b	−1.272 to 0.017	0.056
Verbal Fluency Test
Letter fluency (total correct)	0.001	−0.004 to 0.007	.672
Category fluency (total correct)	0.0005	−0.004 to 0.005	.811
Ruff Figural Fluency Test
Ruff Figural Fluency (total correct)	0.005 b	0.002 to 0.007	<.001
Working memory
Composite score	0.030b	−0.012 to 0.072	.168
WAIS Digit Span
Forward last correct	0.012b	−0.002 to 0.026	.091
Backward last correct	0.009	−0.006 to 0.023	.249
Letter-Number Sequencing (LNS)
LNS scaled score	0.011b	0.002 to 0.020	.012
Auditory N-Back
0-Back d-prime	−0.002	−0.004 to −0.000	.037
2-Back d-prime	−0.001	−0.007 to 0.004	.640
Neuromotor function
Grooved Peg Board dominant hand time	0.00003	−0.00004 to 0.00009	.408
Finger Tap total taps for trials 1–3	0.003b	0.001 to 0.006	<.001
WAIS
Full-scale IQ estimate	0.327b	0.093 to 0.560	.006
WAIS info total scaled score	0.083	−0.024 to 0.191	.128
WAIS picture completion total scaled   score	0.083b	−0.003 to 0.169	.060
Verbal memory
Composite score	−0.017	−0.067 to 0.034	.526
CVLTc trial 5	−0.008	−0.031 to 0.016	.511
CVLT total learning slope trials 1–5	−0.009	−0.038 to 0.021	.565

Note: Bolded values are statistically significant at the P = .05 level; GLM, generalized linear models; CVLT, California Verbal Learning Test; WAIS III, Wechsler Adult Intelligence Scale III.

^aAll adjusted for gestational age.

^bParameter indicates worse performance for lower birth weight.

^cAll CVLT scores are standard scores.