Associations between frequency of e-cigarette use and socio-demographic and smoking characteristics of participants in Year 11 (15–16 years)
| Occasional use (less than weekly) | Regular use (weekly or more) | |||
|---|---|---|---|---|
| n (%) | RRR (95% CI) | n (%) | RRR (95% CI) | |
| Gender | ||||
| Male | 85 (3.7) | 1.00 | 182 (7.7) | 1.00 |
| Female | 84 (3.1) | 0.80 (0.56 to 1.15) | 106 (3.8) | 0.47 (0.24 to 0.65) |
| Ethnicity | ||||
| White | 150 (3.4) | 1.00 | 237 (5.4) | 1.00 |
| BME | 16 (2.8) | 0.82 (0.43 to 1.58) | 42 (7.2) | 1.36 (0.89 to 2.09) |
| FAS | – | 0.99 (0.93 to 1.05) | – | 0.89 (0.85 to 0.96) |
| Ever smoked cigarettes | ||||
| No | 44 (1.2) | 1.00 | 35 (1.0) | 1.00 |
| Yes | 122 (9.5) | 10.51 (7.03 to 15.70) | 240 (18.0) | 25.98 (16.99 to 39.72) |
| Frequency of current tobacco use | ||||
| I do not smoke | 83 (2.0) | 1.00 | 80 (1.9) | 1.00 |
| Less than once a week | 32 (16.6) | 12.17 (7.82 to 18.94) | 32 (16.5) | 12.62 (7.95 to 20.06) |
| At least once a week (but not every day) | 13 (11.1) | 7.68 (3.83 to 15.41) | 25 (21.0) | 15.33 (8.95 to 26.26) |
| Every day | 28 (9.4) | 8.53 (5.06 to 14.38) | 119 (38.0) | 37.62 (24.79 to 57.10) |
| Ex-smoker | 9 (7.1) | 4.55 (2.02 to 10.26) | 25 (19.6) | 13.11 (8.29 to 20.76) |
| Ever cannabis use | ||||
| No | 87 (2.4) | 1.00 | 63 (10.0) | 1.00 |
| Yes | 73 (1.9) | 6.00 (4.11 to 8.76) | 152 (23.1) | 17.25 (12.68 to 23.46) |
| Cannabis use | ||||
| None | 113 (2.8) | 1.00 | 115 (2.8) | 1.00 |
| Less than daily | 30 (12.2) | 6.77 (4.84 to 9.46) | 67 (27.2) | 14.85 (10.03 to 21.99) |
| Every day | 9 (10.1) | 7.43 (3.22 to 17.15) | 45 (47.6) | 36.49 (20.24 to 65.78) |
| Ever used mephedrone | ||||
| No | 142 (3.4) | 1.00 | 188 (4.4) | 1.00 |
| Yes | 10 (9.8) | 4.82 (2.40 to 9.71) | 46 (39.2) | 16.76 (9.38 to 29.94) |
| Ever used laughing gas | ||||
| No | 83 (2.6) | 1.00 | 71 (6.0) | 1.00 |
| Yes | 118 (3.7) | 2.54 (1.84 to 3.51) | 119 (9.5) | 2.99 (2.20 to 4.07) |
| Alcoholic drinks per session | ||||
| None | 20 (1.0) | 1.00 | 26 (1.3) | 1.00 |
| 1–5 | 62 (3.3) | 3.36 (1.94 to 5.82) | 90 (4.6) | 3.75 (2.23 to 6.31) |
| 5+ | 82 (8.3) | 10.13 (6.20 to 16.54) | 152 (14.9) | 14.44 (8.49 to 24.57) |
Bold values signify significant findings p<0.05.
BME, black and minority ethnicity; FAS, Family Affluence Scale, RRR; relative risk ratio.