Construct information on the components of the theory of planned behaviour
| Construct | Number of items | Range | N | Mean/SD | Cronbach's α | Cumulative variance contribution (%)* |
|---|---|---|---|---|---|---|
| Attitude towards smoking cessation | 3 | 3–15 | 3674 | 8.45/2.33 | 0.739 | 65.67 |
| Subjective norm | NB×MC | 4–80 | 3664 | 27.63/12.36 | 0.706 | – |
| Normative beliefs (NB) | 4 | 4–21 | 3670 | 11.39/3.18 | 0.794 | 63.50 |
| Motivation to comply (MC) | 1 | 1–4 | 3670 | 2.60/0.75 | – | – |
| Self-efficacy | 1 | 1–5 | 3675 | 2.86/3.18 | – | – |
*Factor analyses calculated the proportion of variance explained by the construct of the combined variables.