Multivariate associations between e-cigarette use and socio-demographic and smoking status among all participants (aged 11–16 years)
| Ever use | Frequency of use | ||
|---|---|---|---|
| Occasional use (less than weekly) | Regular use (weekly or more) | ||
| OR (95% CI) | RRR (95% CI) | RRR (95% CI) | |
| Gender | |||
| Male | 0.83 (0.75 to 0.91) | 0.71 (0.57 to 0.87) | 0.50 (0.38 to 0.66) |
| Female | – | – | – |
| Ethnicity | |||
| White | – | – | – |
| BME | 0.91 (0.75 to 1.11) | 1.04 (0.74 to 1.46) | 1.26 (0.97 to 1.65) |
| FAS | 0.99 (0.97 to 1.01) | 1.03 (0.98 to 1.07) | 1.02 (0.97 to 1.07) |
| Frequency of current tobacco use | |||
| I do not smoke | – | – | – |
| Less than once a week | 36.66 (26.58 to 50.57) | 31.93 (23.73 to 42.95) | 31.93 (23.73 to 42.95) |
| At least once a week (but not every day) | 75.53 (47.70 to 119.61) | 23.04 (14.64 to 36.26) | 72.38 (46.87 to 111.80) |
| Every day | 70.29 (50.71 to 97.44) | 22.51 (15.56 to 32.55) | 107.17 (76.73 to 149.70) |
| Ex-smoker | 37.87 (26.77 to 53.57) | 9.05 (5.61 to 14.59) | 28.07 (18.88 to 41.74) |
Bold values signify significant findings p<0.05.
BME, black and minority ethnicity; FAS, Family Affluence Scale; RRR, relative risk ratio.