Table 5 The relationships between TPB variables and knowledge of e-cigarettes in current users and non-users, aged 11–16 years

 Intentions

1

0.550^a

0.180

0.418^a

0.128

0.036

 Attitude

1

0.212

0.323^b

0.175

0.067

 Subjective Norm

1

−0.039

−0.099

0.082

 Self-efficacy

1

0.470^a

0.198

 PBC

1

0.108

 Knowledge of EC

1

 Intention

1

0.577^a

0.514^a

0.487^a

0.191^a

0.079^a

 Attitude

1

0.483^a

0.481^a

0.208^a

0.150^a

 Subjective Norm

1

0.382^a

0.113^a

0.096^a

 Self-efficacy

1

0.487^a

0.092^a

 PBC

1

0.040

 Knowledge of EC

1