TABLE 3.
Correlations between sleep behaviour and screen time and MVPA
| Screen time | MVPA | Mid-sleep time | Sleep duration | Social jetlag | |
|---|---|---|---|---|---|
| Mid-sleep time | 0.458*** | −0.536*** | |||
| Sleep duration | −0.267** | 0.293*** | −0.529*** | ||
| Social jetlag | 0.170* | −0.113 | 0.292*** | −0.114 | |
| Sleep problemsa | 0.121 | −0.051 | 0.246** | −0.181* | −0.009 |
Abbreviation: MVPA, moderate-to-vigorous physical activity.
Correlations involving the dichotomous sleep-problems variable are point-biserial correlations, otherwise the table shows the Pearson product-moment correlations.
P < .05.
P < .01.
P < .001.