Relationship of hematocrit to WISC-III scores in children with sickle cell disease
| Test Measure or Factor Score | Sample Size | Correlation r = | ANOVA P < | Adjusted R2 |
|---|---|---|---|---|
| WISC-III FSIQ | 30 | 0.50 | 0.005 | 22.7 |
| Verbal IQ | 30 | 0.42 | 0.02 | 14.8 |
| Performance IQ | 30 | 0.46 | 0.01 | 18.8 |
| WISC-III factor scores | ||||
| VC factor | 19 | 0.50 | 0.006 | 22.2 |
| PO factor | 20 | 0.46 | 0.01 | 18.8 |
| FD factor | 19 | 0.39 | 0.04 | 12.2 |
| PS factor | 18 | 0.13 | NS | 0.0 |
Note.—WISC-III indicates Wechsler Intelligence Scales for Children-Version III; ANOVA, analysis of variance; FSIQ, full-scale intelligence quotient; IQ, intelligence quotient; VC, verbal comprehension; PO, perceptual organization; FD, freedom from distractibility; PS, processing speed; NS, not significant. Regression of hematocrit with full-scale intelligence quotient and with various sub-tests or factor scores of the WISC-III. The correlation (r) is reported, together with the level of significance calculated by analysis of variance. The proportion of variance in psychometric measures, explained by hematocrit (R2), is expressed as a percentage.