Table 5.
Association of school-level past 30-day e-cigarette use prevalence with student-level past 30-day NCTP usea.
| NCTPs | School-level past 30-day e-cigarette use prevalence | ||||
|---|---|---|---|---|---|
| Lowb | Mediumb | Highb | Per 1% increasec | ||
| Waterpipe | CORs (95% CIs) | 1 | 2.07 (1.05–4.06)* | 5.05 (2.75–9.28)*** | 1.25 (1.15–1.35)*** |
| AORs (95% CIs) d | 1 | 0.92 (0.44–1.94) | 1.80 (0.86–3.76) | 1.11 (0.99–1.24) | |
| Chewing tobacco | CORs (95% CIs) | 1 | 3.00 (0.71–12.71) | 6.53 (1.70–25.02)** | 1.31 (1.15–1.49)*** |
| AORs (95% CIs) d | 1 | 0.81 (0.22–3.04) | 1.10 (0.29–4.11) | 1.13 (0.96–1.33) | |
| Cigar | CORs (95% CIs) | 1 | 4.16 (1.44–12.03)** | 7.59 (2.77–20.81)*** | 1.25 (1.10–1.43)** |
| AORs (95% CIs) d | 1 | 1.20 (0.43–3.38) | 1.52 (0.53–4.33) | 0.96 (0.84–1.11) | |
| Snus | CORs (95% CIs) | 1 | 2.14 (0.91–5.02) | 3.31 (1.52–7.19)** | 1.21 (1.11–1.32)*** |
| AORs (95% CIs) d | 1 | 0.63 (0.23–1.72) | 0.61 (0.22–1.74) | 0.99 (0.85–1.15) | |
| Smoking pipe | CORs (95% CIs) | 1 | 1.79 (0.44–7.26) | 4.19 (1.17–14.97)* | 1.25 (1.06–1.46)** |
| AORs (95% CIs) d | 1 | 0.56 (0.13–2.32) | 0.83 (0.19–3.61) | 1.03 (0.84–1.27) | |
| Other tobacco products | CORs (95% CIs) | 1 | 3.23 (1.14–9.15)* | 3.68 (1.34–10.11)* | 1.18 (1.03–1.35)* |
| AORs (95% CIs) d | 1 | 1.33 (0.34–5.19) | 0.95 (0.21–4.24) | 0.95 (0.76–1.18) | |
*P < 0.05; **P < 0.01; ***P < 0.001.
CORs = crude odds ratios; AORs = adjusted odds ratios.
aNCTP = Non-cigarette tobacco product. The analysis was conducted in a subsample (10923 students; 30 schools) of the whole sample (40202 students; 92 schools). Only the subsample had data on NCTP use.
bLow: 0–2.00%; medium: 2.07–4.07%; high: 4.10–12.57%.
cPer 1% increase was per unit increase in school-level past 30-day e-cigarette use prevalence (continuous; range 0–12.57).
dWith adjustment of age, sex, perceived family affluence, school-level past 30-day cigarette smoking prevalence (continuous), e-cigarette use status, and cigarette smoking status.