Table 1 Demographic characteristics of participants (n = 3840)
| Â | Unweighted | Weighted |
|---|---|---|
Mean age in years | 19.6 (95% CI: 19.5–19.6) | 19.6 (95% CI: 19.5–19.6) |
Sex (% female) | 57.7% (95% CI: 56.1–59.3) | 49.5% (95% CI: 49.0–50.0) |
Nationality (% Swiss) | 77.1% (95% CI: 75.8–78.5) | 81.3% (95% CI: 81.2–81.4) |
Region (%) | ||
 German-speaking | 65.4% (95% CI: 63.9–66.9) | 68.3% (95% CI: 67.7–68.9) |
 French-speaking | 28.6% (95% CI: 27.2–30.1) | 27.1% (95% CI: 26.5–27.6) |
 Italian-speaking | 6.0% (95% CI: 5.3–6.8) | 4.7% (95% CI: 4.4–4.9) |