Table 3

Multivariate logistic regressions on ‘ever smoked a cigarette’ in 2016

VariableModel 1—adjusted main effects model (n=1806)Model 2—adjusted model including interactions (n=1806)Model 3—imputed model with interactions (n=2520)
ORCIpORCIpORCIp
E-cigarette ever use 20152.421.63 to 3.60<0.0015.973.12 to 11.40<0.0016.643.60 to 12.26<0.001
Susceptibility to smoking 20153.652.70 to 4.94<0.0014.132.98 to 5.72<0.0015.193.74 to 7.21<0.001
Any family member smokes 20151.891.40 to 2.56<0.0011.931.43 to 2.61<0.0011.831. 37 to 2.44<0.001
‘At least some’ friends smoke 20151.330.95 to 1.850.0941.561.09 to 2.250.0161.511.07 to 2.140.020
Interaction between e-cigarette and susceptibility0.420.19 to 0.940.0360.420.20 to 0.880.021
Interaction between e-cigarette and friends smoking0.490.23 to 1.070.0720.520.25 to 1.090.082