Table 3.
Correlations (r(p)) of variables of interest with covariates (N = 45, except birth weight percentile N = 44).
| Infant sex | Gestational age at birth | SES | Birth weight percentile | |
|---|---|---|---|---|
| GMV (res.) | −.03 (.85) | .22 (.16) | .16 (.29) | .02 (.91) |
| WMV (res.) | −.15 (.34) | .13 (.39) | .08 (.61) | .08 (.60) |
| Intercept | −.05 (.77) | −.08 (.62) | .01 (.94) | −.15 (.32) |
| Slope (res.) | −.05 (.76) | .17 (.27) | −.01 (.93) | .20 (.20) |
| Average sleep | −.07 (.64) | .06 (.68) | .05 (.74) | .08 (.59) |
| Sleep at 1-mo | −.13 (.38) | −.12 (43) | .01 (.93) | .04 (.78) |
| Sleep at 3-mos | −.07 (.65) | −.01 (.93) | .07 (.63) | −.07 (.66) |
| Sleep at 6-mos | −.08 (.58) | .10 (.51) | −.02 (.90) | .20 (.21) |
| Sleep at 9-mos | −.01 (.96) | .21 (.17) | .11 (.47) | .27 (.08) |
| Sleep at 12-mos | .11 (.48) | .24 (.11) | .03 (.83) | −.08 (.62) |
Note. WMV = white matter volume; GMV = gray matter volume; Slope was residualised for intercept, WMV and GMV were residualised for intracranial volume and age at scan.