Table 2

Univariate associations of socio-demographic characteristics and use of other substances with ever use of e-cigarettes

 All year groups (11–16 years)Year 11 (15–16 years) only
% (n)RRR (95% CI)% (n)RRR (95% CI)
Sex
 Male19.3 (2795)0.88 (0.82 to 0.96)37.6 (866)0.96 (0.82 to 1.12)
 Female17.7 (2792)1.0037.2 (994)1.00
Ethnicity
 White18.6 (4896)1.0037.6 (1635)1.00
 BME19.1 (602)1.03 (0.82 to 1.31)35.4 (203)0.91 (0.61 to 1.35)
FAS0.96 (0.94 to 0.98)0.95 (0.93 to 0.98)
Ever smoked
 No10.4 (2789)1.0019.9 (722)1.00
 Yes85.9 (2712)52.96 (44.31 to 63.29)85.0 (1122)23.08 (17.48 to 30.48)
Smoking status
 I do not smoke13.6 (3835)1.0027.7 (1149)1.00
 Less than once a week84.6 (366)34.80 (24.87 to 48.70)82.1 (156)12.09 (7.23 to 20.23)
 At least once a week (but not every day)90.8 (286)65.07 (39.03 to 108.47)89.0 (109)22.10 (11.85 to 41.19)
 Every day92.4 (607)74.36 (53.76 to 102.86)92.6 (280)32.08 (19.22 to 53.55)
 Ex-smoker85.4 (298)37.97 (27.34 to 52.74)85.0 (111)14.62 (8.98 to 23.82)
Ever used cannabis
 No14.1 (3496)1.0027.3 (998)1.00
 Yes86.8 (1121)39.60 (30.92 to 50.71)87.2 (561)18.24 (13.56 to 24.55)
Cannabis use
 None15.7 (3995)1.0031.7 (1263)1.00
 Less than daily90.7 (467)50.47 (34.71 to 73.38)92.3 (225)25.78 (14.87 to 44.71)
 Every day86.7 (184)33.14 (21.92 to 50.10)89.7 (85)18.51 (9.89 to 34.62)
Ever used mephedrone
 No17.3 (4450)1.0035.8 (1511)1.00
 Yes73.8 (233)13.02 (9.20 to 18.42)83.0 (93)8.89 (5.48 to 14.43)
Ever used laughing gas
 No13.0 (2479)1.0030.8 (972)1.00
 Yes31.9 (2255)3.18 (2.92 to 3.46)53.2 (634)2.58 (2.21 to 3.01)
Alcohol
 None7.2 (1551)1.0014.4 (279)1.00
 1–537.2 (2349)7.63 (6.93 to 8.41)40.5 (764)4.04 (3.44 to 4.75)
 5+72.0 (1326)33.51 (28.96 to 38.77)71.5 (713)15.08 (11.96 to 19.03)
  • Bold values signify significant findings p<0.05.

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