Correlations between occipitofrontal circumference z scores (zOFC) at four different ages, and change in zOFC between those ages, and intelligence quotient (IQ) and test of motor impairment (TOMI) scores, corrected for z score birth weight and social class
| IQ full | IQ verbal | IQ perform | TOMI | |
|---|---|---|---|---|
| Significant correlation indicated: *p<0.05, **p<0.01, ***p<0.001. | ||||
| OFCB, Occipitofrontal circumference at birth; OFCD, OFC at discharge; OFC4, OFC at 4 years of age; OFC15, OFC at 15 years of age; dzOFC1, change in OFC between birth and discharge; dzOFC2, change in OFC between discharge and 4 years; dzOFC3, change in OFC between 4 and 15 years. | ||||
| zOFCB | 0.15 | 0.14 | 0.14 | −0.23** |
| zOFCD | 0.08 | 0.09 | 0.06 | −0.34*** |
| zOFC4 | 0.17* | 0.14 | 0.16* | −0.21** |
| zOFC15 | 0.18* | 0.20* | 0.12 | −0.15* |
| dzOFC1 | 0.04 | 0.04 | 0.02 | −0.24* |
| dzOFC2 | 0.06 | 0.07 | 0.04 | −0.01 |
| dzOFC3 | 0.03 | 0.10 | −0.05 | 0.11 |