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Table 1 Descriptive and correlations analyses for variables

From: Longitudinal relationships among problematic mobile phone use, bedtime procrastination, sleep quality and depressive symptoms in Chinese college students: a cross-lagged panel analysis

Variables 1 2 3 4 5 6 7 8
1. Problematic mobile phone use-T1        
2. Bedtime procrastination-T1 0.435*       
3. Sleep quality-T1 0.365* 0.442*      
4. Depressive symptoms-T1 0.431* 0.362* 0.571*     
5. Problematic mobile phone use-T2 0.526* 0.328* 0.277* 0.364*    
6. Bedtime procrastination-T2 0.283* 0.458* 0.334* 0.236* 0.340*   
7. Sleep quality-T2 0.285* 0.324* 0.494* 0.378* 0.435* 0.417*  
8. Depressive symptoms-T2 0.324* 0.301* 0.348* 0.451* 0.496* 0.378* 0.581*
Mean 39.20 25.36 4.70 5.76 37.08 24.92 4.02 4.63
Standard deviation 12.27 6.46 2.91 4.37 13.62 5.26 2.93 4.41
  1. *p < .01. T1 = Time 1, T2 = Time 2