Table 2.
Test-Retest Reliability Statistics for Tobacco Dependence Measures
| Scale | Scale | Cronbach’s alpha T1 | Cronbach’s alpha T2 | Cronbach’s alpha T1T2 | Single measures ICC | ICC, 95% CI lower bound | ICC, 95% CI upper bound | Mean T1 | SD T1 | Mean T2 | SD T2 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Fagerstrom Test for Nicotine Dependence | 0–10 | 0.695 | 0.698 | 0.890 | 0.799 | 0.755 | 0.836 | 4.024 | 2.509 | 4.271 | 2.502 |
| HSI | 0–6 | 0.677 | 0.621 | 0.885 | 0.790 | 0.745 | 0.828 | 2.302 | 1.610 | 2.448 | 1.546 |
| How soon after waking do you smoke | 0–3 | — | — | 0.850 | 0.737 | 0.683 | 0.783 | 1.491 | 1.040 | 1.585 | 1.028 |
| How many cigarettes do you smoke a day | 0–3 | — | — | 0.873 | 0.773 | 0.725 | 0.813 | 0.811 | 0.794 | 0.863 | 0.767 |
| WISDM scales | |||||||||||
| Total score | 11–70 | 0.967 | 0.966 | 0.888 | 0.796 | 0.751 | 0.833 | 46.762 | 13.873 | 48.025 | 13.740 |
| Primary dependence motives | 1–7 | 0.955 | 0.956 | 0.900 | 0.815 | 0.774 | 0.849 | 4.361 | 1.494 | 4.513 | 1.472 |
| Automaticity | 1–7 | 0.915 | 0.922 | 0.851 | 0.740 | 0.687 | 0.785 | 4.333 | 1.708 | 4.451 | 1.731 |
| Loss of control | 1–7 | 0.902 | 0.894 | 0.880 | 0.783 | 0.737 | 0.822 | 4.372 | 1.697 | 4.520 | 1.623 |
| Tolerance | 1–7 | 0.860 | 0.858 | 0.905 | 0.820 | 0.777 | 0.855 | 4.094 | 1.7 | 4.312 | 1.695 |
| Craving | 1–7 | 0.896 | 0.892 | 0.883 | 0.788 | 0.743 | 0.826 | 4.648 | 1.569 | 4.768 | 1.539 |
| Secondary dependence motives | 1–7 | 0.943 | 0.942 | 0.877 | 0.780 | 0.733 | 0.819 | 4.188 | 1.259 | 4.282 | 1.259 |
| Taste | 1–7 | 0.850 | 0.882 | 0.800 | 0.666 | 0.602 | 0.723 | 5.182 | 1.373 | 5.2222 | 1.377 |
| Cognitive enhancement | 1–7 | 0.904 | 0.927 | 0.840 | 0.720 | 0.662 | 0.769 | 4.151 | 1.685 | 4.353 | 1.733 |
| Weight control | 1–7 | 0.876 | 0.886 | 0.875 | 0.777 | 0.730 | 0.816 | 3.366 | 1.759 | 3.476 | 1.791 |
| Cue exposure | 1–7 | 0.736 | 0.762 | 0.810 | 0.681 | 0.618 | 0.735 | 4.471 | 1.434 | 4.544 | 1.455 |
| Affective enhancement | 1–7 | 0.869 | 0.895 | 0.841 | 0.726 | 0.670 | 0.773 | 4.321 | 1.609 | 4.396 | 1.652 |
| Social goads | 1–7 | 0.935 | 0.938 | 0.847 | 0.735 | 0.681 | 0.781 | 4.047 | 1.808 | 4.069 | 1.836 |
| Affiliative attachment | 1–7 | 0.894 | 0.895 | 0.857 | 0.747 | 0.695 | 0.792 | 3.776 | 1.783 | 3.916 | 1.821 |
CI = confidence interval; HSI = Heaviness of Smoking Index; SE = standard error; WISDM = Wisconsin Inventory of Smoking Dependence Motives. T1 refers to the first administration; T2 the second administration; Cronbach’s alpha T1T2 refers to the alpha for the full scale; ICC refers to the single measures intraclass correlation coefficient.