Table 2.

Correlations between sleep duration, midpoint of sleep, CSM scores and SAPS and SAS controlling for age and gender

	Study 1 (SAPS)	Study 2 (SAS)
CSM score	−.347**	−.349**
SDR at weekday	−.192**	−.294**
SDR at weekend	.032	−.041
MS at weekday	.137*	.265**
MS at weekend	.219**	.329**

Note. SAPS: Smartphone Addiction Proneness Scale; SAS: Smartphone Addiction Scale; CSM: Composite Scale of Morningness; SDR: sleep duration; MS: midpoint of sleep.

^*Correlation is significant at the 0.05 level.

^**Correlation is significant at the 0.01 level.