Table 1 Analysis of the interaction effect on smoking cessation outcomes at the 6-month follow-up

Interaction term

Group allocation X Hardcore status

Dependent variable

7-day abstinence

2.81 (0.34, 23.07)

0.34

Dependent variable

Any quit attempt (including quitters)

2.42 (0.67, 8.79)

0.18

Dependent variable

Smoking reduction by at least 50% (including quitters)

0.72 (0.29, 1.84)

0.50

Interaction term

Group allocation X Smokers whose daily cigarette consumption ≥15

Dependent variable

7-day abstinence

0.56 (0.21, 1.53)

0.26

Dependent variable

Any quit attempt (including quitters)

0.73 (0.37, 1.46)

0.38

Dependent variable

Smoking reduction by at least 50% (including quitters)

0.96 (0.46, 1.97)

0.90

Interaction term

Group allocation X Smokers with quit attempt experience

Dependent variable

7-day abstinence

2.15 (0.45, 10.17)

0.33

Dependent variable

Any quit attempt (including quitters)

1.34 (0.52, 3.42)

0.54

Dependent variable

Smoking reduction by at least 50% (including quitters)

0.68 (0.29, 1.59)

0.38