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Table 2 Inter-correlation * between the nine items **

From: Perceived problems with computer gaming and internet use among adolescents: measurement tool for non-clinical survey studies

Item 1 2 3 4 5 6 7 8 9
1. I think I spend way too much time playing computer games 1.00 0.37 0.63 0.30 0.09 0.23 0.40 0.24 0.30
2. I get in bad mood when I cannot spend time on computer games   1.00 0.47 0.16 0.40 0.25 0.26 0.49 0.31
3. My parents tell me, I spend way too much time on computer gaming    1.00 0.19 0.12 0.41 0.30 0.28 0.42
4. I think I spend way too much time on internet communication and surfing     1.00 0.46 0.57 0.19 0.15 0.15
5. I get in bad mood when I cannot spend time on internet communication and surfing      1.00 0.52 0.09 0.32 0.17
6. My parents say, that I spend way too much time on internet communication and surfing       1.00 0.16 0.24 0.29
7. I think I spend way too much time on console-gaming        1.00 0.57 0.68
8. I get in bad mood when I cannot spend time on console-gaming         1.00 0.63
9. My parents tell me, I spend way too much time on console-gaming          1.00
  1. *Spearman correlation coefficients, all correlation coefficients are statistically significant, p < 0.0001.
  2. **The inter-correlations between the three indexes were: computer gaming and console gaming index 0.33, computer gaming and internet use 0.28, and console gaming and internet use 0.19.