Table 1 The correlations among variables

1. Subjective well-being

―

2. Average hours using the internet per week

− 0.13^***

―

3. Problematic internet use

− 0.39^***

0.37^***

―

 4. Compulsive use of internet

− 0.37^***

0.32^***

0.91^***

―

 5. Withdrawal

− 0.35^***

0.31^***

0.87^***

0.80^***

―

 6. Tolerance

− 0.27^***

0.33^***

0.86^***

0.73^***

0.71^***

―

 7. Interpersonal and health-related

 problems

− 0.36^***

0.27^***

0.89^***

0.75^***

0.66^***

0.68^***

―

 8. Time management problems

− 0.33^***

0.38^***

0.83^***

0.66^***

0.61^***

0.65^***

0.70^***

―

9. Self-esteem

0.72^***

− 0.10^**

− 0.37^***

− 0.36^***

− 0.31^***

− 0.28^***

− 0.33^***

− 0.30^***

―

 10. Positive aspects

0.65^***

− 0.08^**

− 0.25^***

− 0.25^***

− 0.21^***

− 0.17^***

− 0.23^***

− 0.22^***

0.85^***

―

 11. Negative aspects

0.61^***

− 0.08^**

− 0.38^***

− 0.36^***

− 0.33^***

− 0.31^***

− 0.34^***

− 0.30^***

0.89^***

0.52^***

―

M

24.36

24.77

53.20

10.04

10.80

9.12

13.61

9.63

37.49

18.70

18.80

SD

6.29

21.31

16.26

3.72

3.95

3.03

4.57

3.41

10.33

5.42

6.40