Table 3

Univariate associations of socio-demographic characteristics and use of other substances with frequency of e-cigarette use

 Occasional use (less than weekly)Regular use (weekly or more)
n (%)RRR (95% CI)n (%)RRR (95% CI)
Gender
 Male284 (1.9)0.81 (0.67 to 0.99)477 (3.1)0.65 (0.52 to 0.81)
 Female258 (1.6)1.00345 (2.1)1.00
Ethnicity
 White467 (1.7)1.00665 (2.5)1.00
 BME65 (1.8)1.18 (0.86 to 1.61)135 (4.2)1.71 (1.28 to 2.29)
FAS0.99 (0.95 to 1.04)0.94 (0.89 to 0.99)
Ever smoked cigarettes
 No179 (0.7)1.00141 (0.5)1.00
 Yes343 (11.0)23.93 (19.49 to 29.37)640 (20.0)56.67 (44.40 to 72.33)
Frequency of current tobacco use
 I do not smoke300 (1.0)1.00248 (0.9)1.00
 Less than once a week81 (18.1)28.39 (21.42 to 37.63)95 (21.5)40.28 (30.19 to 51.22)
 At least once a week (but not every day)43 (13.6)22.20 (14.81 to 33.26)93 (29.3)58.07 (39.45 to 85.48)
 Every day67 (10.0)19.61 (13.92 to 27.63)292 (41.8)103.37 (77.94 to 137.10)
 Ex-smoker25 (7.1)8.70 (5.52 to 13.70)61 (17.5)25.67 (18.16 to 36.31)
Ever cannabis use
 No292 (1.1)1.00267 (1.1)1.00
 Yes146 (11.4)15.34 (11.87 to 19.83)364 (26.8)41.82 (33.48 to 52.25)
Cannabis use
 None351 (1.3)1.00355 (1.4)1.00
 Less than daily75 (14.4)19.25 (14.79 to 25.05)173 (32.7)43.90 (32.53 to 59.23)
 Every day16 (7.5)11.61 (5.80 to 23.27)106 (47.0)76.07 (49.91 to 115.92)
Ever used mephedrone
 No426 (1.6)1.00531 (2.0)1.00
 Yes24 (7.8)7.69 (5.05 to 11.71)126 (36.5)32.39 (23.05 to 45.52)
Ever used laughing gas
 No208 (1.1)1.00294 (1.5)1.00
 Yes253 (3.5)3.53 (2.97 to 4.18)376 (5.0)3.71 (3.04 to 4.51)
Alcoholic drinks per session
 None110 (0.5)1.00114 (0.5)1.00
 1–5223 (3.4)7.38 (5.76 to 9.46)304 (4.7)9.71 (7.24 to 13.03)
 5+172 (9.3)24.96 (19.07 to 32.65)342 (17.6)47.88 (35.77 to 64.11)
  • Bold values signify significant findings p<0.05.

  • BME, black and minority ethnicity; FAS, Family Affluence Scale; RRR; relative risk ratio.