Table 4.

Birth Weight and Neuropsychological Performance in Control Subjects^a

Domain/Measure	Parameter Estimate	Parameter 95% CI	P Value from GLM
Executive function
Composite score	0.007	−0.059 to 0.074	.828
Wisconsin Card Sort Test
Total errors	−0.005	−0.016 to 0.005	.331
Perseverative errors	0.006	−0.014 to 0.026	.538
Nonperseverative errors	−0.010	−0.023 to 0.003	.132
Trail Making Test
Trails A time	−0.0001	−0.0003 to 0.0001	.548
Trails B time	−0.00002	−0.00011 to 0.00007	.672
Trails B regressed on Trails A	0.003	−0.242 to 0.247	.983
Verbal Fluency Test
Letter fluency (total correct)	−0.003	−0.009 to 0.003	.362
Category fluency (total correct)	0.004	−0.001 to 0.009	.106
Ruff Figural Fluency Test
Ruff Figural Fluency (total correct)	−0.0003	−0.0027 to 0.0022	.832
Working memory
Composite score	0.026	−0.026 to 0.078	.323
WAIS Digit Span
Forward last correct	0.001	−0.018 to 0.020	.901
Backward last correct	0.016b	−0.003 to 0.034	.099
Letter-Number Sequencing (LNS)
LNS scaled score	0.003	−0.007 to 0.013	.600
Auditory N-Back
0-Back d-prime	−0.000	−0.001 to 0.001	.998
2-Back d-prime	0.000	−0.003 to 0.003	.831
Neuromotor function
Grooved Peg Board dominant hand time	−0.00002	−0.00006 to 0.00002	.398
Finger Tap total taps for trials 1–3	0.0001	−0.0020 to 0.0022	.906
WAIS
Full-scale IQ Estimate	0.228	−0.058 to 0.514	.119
WAIS info total scaled score	0.106b	−0.006 to 0.218	.063
WAIS picture completion total scaled    score	0.017	−0.083 to 0.117	.738
Verbal memory
Composite score	0.006	−0.032 to 0.045	.748
CVLTc trial 5	0.006	−0.015 to 0.027	.574
CVLT total learning slope trials 1–5	0.000	−0.021 to 0.022	.976

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.