| Frequency of usage | Univariate | Multivariate | ||
| Female | Male | Female | Male | |
| Never | 25.97% | 45.32% | 26.77% | 34.06% |
| Less than weekly | 50.71% | 43.28% | 57.95% | 54.62% |
| At least weekly | 13.29% | 6.90% | 9.98% | 7.51% |
| Several times a week | 7.55% | 3.44% | 4.20% | 3.03% |
| Daily | 2.49% | 1.07% | 1.10% | 0.78% |