| Functions | Test value = 3 | |||||
| t | df | Sig. (2-tailed) | Mean difference | 95% CI of the difference | ||
| Lower | Upper | |||||
| Marketing and receiving calls | −35.191 | 478 | 0.000 | −1.790 | −1.89 | −1.69 |
| Text messaging | −10.047 | 478 | 0.000 | −0.826 | −0.99 | −0.66 |
| Instant messaging | −17.060 | 478 | 0.000 | −1.232 | −1.37 | −1.09 |
| Browsing the internet | −16.108 | 478 | 0.000 | −1.232 | −1.38 | −1.08 |
| Playing mobile games | −8.518 | 478 | 0.000 | −0.826 | −1.02 | −0.63 |
| Camera | −13.227 | 478 | 0.000 | −0.971 | −1.12 | −0.83 |
| Calendar | −7.758 | 478 | 0.000 | −0.710 | −0.89 | −0.53 |