Distribution, internal reliability, and one week test-retest reliability of indicators of nicotine dependence symptoms among grade 7 past three month smokers
| Internal reliability | Test-retest reliability | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Indicator* | n† | Mean‡ (SD) | Median | Range | n† | Cronbach’s α | n§ | Agreement (%) | ICC (lower 95% CI) |
| *Analyses were conducted using continuous scores. | |||||||||
| †Sample size varied because of missing values. | |||||||||
| ‡Means were calculated as the total score divided by the sum of the total number of items responded to. | |||||||||
| §Among n=14 past three month smokers in one school with 85 subjects. | |||||||||
| CI, confidence interval; HONC, Hooked on Nicotine Checklist; ICC, Intraclass correlation coefficient; ICD-10, International statistical classification of diseases and related health problems, 10th revision; NA, not applicable; ND, nicotine dependence. | |||||||||
| ICD-10 | 233 | 1.2 (1.6) | 1.0 | 0–6 | 183 | 0.91 | 13 | 100.0 | 0.49 (≥−0.01) |
| HONC | 233 | 4.3 (3.4) | 4.0 | 0–11 | 192 | 0.87 | 14 | 78.6 | 0.81 (≥0.51) |
| ND/cravings | 233 | 12.0 (9.5) | 9.6 | 0–38 | 168 | 0.94 | 12 | NA | 0.91 (≥0.75) |
| Withdrawal | 214 | 3.4 (4.5) | 1.0 | 0–18 | 206 | 0.88 | 11 | NA | 0.78 (≥0.40) |
| Self medication | 209 | 2.3 (2.9) | 1.0 | 0–12 | 205 | 0.85 | 9 | NA | 0.74 (≥0.27) |