Table 5.
ICC for HBSC survey questionnaire items about substance use of 15-year-old children by gender (n = 51)
| All (n = 51) | Girls (n = 20) | Boys (n = 31) | ||||
|---|---|---|---|---|---|---|
| ICC | 95% CI | ICC | 95% CI | ICC | 95% CI | |
| Have ever smoked | 0.75 | 0.60-0.85 | NA | / | 0.63 | 0.36-0.80 |
| How often smoke at present | 0.50 | 0.27-0.68 | NA | / | 0.48 | 0.15-0.71 |
| How many cigarettes ever smoked | 0.85 | 0.75-0.91 | NA | / | 0.81 | 0.64-0.90 |
| How often drink beer | 0.80 | 0.67-0.88 | 0.96 | 0.90-0.98 | 0.82 | 0.66-0.91 |
| How often drink wine | 0.53 | 0.30-0.70 | 0.70 | 0.39-0.87 | 0.42 | 0.09-0.67 |
| How often drink strong liquors | 0.44 | 0.19-0.64 | 0.76 | 0.49-0.90 | 0.64 | 0.37-0.81 |
| Have ever been drunk | 0.85 | 0.76-0.91 | 0.83 | 0.61-0.93 | 0.85 | 0.72-0.93 |
ICC = Single measure intraclass correlation coefficient
HBSC = Health Behaviour in School-aged Children
NA: Not applicable due to lack of variance