| Duration | N | Mean | SD | SE | 95% CI for mean | F | df | sig | Ŋ2 | |
| Lower | Upper | |||||||||
| More than 5 years | 252 | 40.599 | 10.992 | 0.692 | 39.235 | 41.963 | 3.564 | 3619 | 0.014 | 0.02 |
| Around 1 to 4 years | 348 | 39.728 | 9.184 | 0.492 | 38.760 | 40.697 |
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| Less than 1 year | 6 | 36.542 | 11.703 | 4.778 | 24.260 | 48.823 |
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|
| Have not used it at all | 17 | 32.794 | 7.954 | 1.929 | 28.705 | 36.884 |
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| Total | 623 | 39.861 | 10.012 | 0.401 | 39.073 | 40.649 |
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