TABLE 1.
Correlation of sleep quality, sleep duration and fractional anisotropy with cognitive subscores
| Sleep quality | Sleep duration | Fractional anisotropy | |
|---|---|---|---|
| NIH total cognition score | |||
| Pearson's r | .002 | .097 *** | .089 ** |
| p‐value | .938 | <.001 | .004 |
| df | 1,183 | 1,183 | 1,046 |
| Flanker inhibitory control and attention test: Executive function | |||
| Pearson's r | .005 | .015 | .010 |
| p‐value | .863 | .597 | .754 |
| df | 1,183 | 1,183 | 1,046 |
| Picture sequence memory: (nonverbal) episodic memory | |||
| Pearson's r | −.007 | .052 | .064 * |
| p‐value | .813 | .073 | .038 |
| df | 1,183 | 1,183 | 1,046 |
| List sorting working memory test | |||
| Pearson's r | .028 | .041 | .088 ** |
| p‐value | .330 | .162 | .005 |
| df | 1,183 | 1,183 | 1,046 |
| Picture vocabulary test: Vocabulary knowledge | |||
| Pearson's r | −.005 | .116 *** | .038 |
| p‐value | .853 | <.001 | .214 |
| df | 1,183 | 1,183 | 1,046 |
| Oral reading recognition test: Reading decoding skills | |||
| Pearson's r | −.014 | .135 *** | .060 |
| p‐value | .640 | <.001 | .053 |
| df | 1,183 | 1,183 | 1,046 |
| Dimensional change card sort test: Executive function and cognitive flexibility | |||
| Pearson's r | .018 | .049 | .055 |
| p‐value | .539 | .092 | .073 |
| df | 1,183 | 1,183 | 1,046 |
| Pattern comparison processing speed test | |||
| Pearson's r | −.001 | −.003 | .055 |
| p‐value | .967 | .904 | .077 |
| df | 1,183 | 1,183 | 1,046 |
Note: Sleep duration: Hours of actual sleep at night; Sleep quality: Overall rating of subjective sleep quality on a 0–3 scale; SLF: superior longitudinal fasciculus; FA: fractional anisotropy, mean value extracted from the FA‐global cognition association results mask; Pearson's r = Pearson correlation coefficient; p‐value = value determining statistical significance, *** p < .001; ** p < .01; * p < .05, values < .05 in bold font; df = degrees of freedom; for more information on the cognitive subscores see Supplementary Material S2.