Table 5 Mean scores of Mood Inventory subcomponents according to overall quartiles of hours of mobile phone use per week stratified by Internet use
Mood Inventory subcomponents | Hours of mobile phone use per week | P for trenda | P valuesb (ANCOVA) | Bonferroni’s multiple comparison (P < 0.05) | |||
|---|---|---|---|---|---|---|---|
Quartile 1: < 10 h/week | Quartile 2: 10–18 h/week | Quartile 3: 19–32 h/week | Quartile 4: ≥33 h/week | ||||
Internet users | N = 346 | N = 422 | N = 491 | N = 508 | |||
Tension and excitement | 13.6 (4.1) | 13.8 (4.2) | 14.0 (3.9) | 14.7 (3.9) | <0.001 | <0.002 | Quartile 1 vs. quartile 4; quartile 2 vs. quartile 4 |
Refreshing mood | 13.7 (2.7) | 14.1 (3.0) | 13.9 (2.7) | 13.8 (2.7) | 0.407 | 0.274 | – |
Fatigue | 15.6 (3.8) | 16.0 (3.9) | 16.2 (3.89 | 16.7 (4.0) | <0.003 | <0.025 | Quartile 1 vs. quartile 4 |
Depressed mood | 15.6 (5.3) | 15.5 (5.3) | 15.6 (4.8) | 16.7 (4.9) | <0.022 | <0.007 | Quartile 2 vs. quartile 4; quartile 3 vs. quartile 4 |
Anxious mood | 17.5 (5.2) | 17.4 (5.1) | 17.9 (4.9) | 18.3 (4.6) | <0.023 | 0.090 | – |
Internet non-users | N = 374 | N = 198 | N = 200 | N = 135 | |||
Tension and excitement | 13.9 (4.0) | 13.8 (3.5) | 14.0 (4.0) | 14.4 (4.3) | 0.418 | 0.788 | – |
Refreshing mood | 14.0 (2.8) | 13.7 (2.7) | 14.1 (3.0) | 14.3 (2.9) | 0.454 | 0.302 | – |
Fatigue | 15.1 (3.9) | 15.5 (3.4) | 15.1 (3.4) | 15.9 (3.9) | 0.339 | 0.408 | – |
Depressed mood | 15.0 (4.8) | 15.4 (4.5) | 14.6 (4.4) | 15.7 (5.0) | 0.935 | 0.337 | – |
Anxious mood | 17.3 (4.9) | 17.4 (4.2) | 16.6 (4.6) | 17.5 (4.7) | 0.224 | 0.214 | – |