TABLE 3.
Quit Rates and Adjusted Odds Ratios in Intervention Compared With Control Schools Among All Students and According to Gender
| 3 mo |
12 mo |
|||||||
|---|---|---|---|---|---|---|---|---|
| Unadjusted % Quit | Model 1, Adjusted OR (95% CI)a | Model 2, Adjusted OR (95% CI)b | Pb | Unadjusted % Quit | Model 1, Adjusted OR (95% CI)a | Model 2, Adjusted OR (95% CI)b | Pb | |
| Self-reported quitting among all students | — | 2.01 (1.16–3.49) | 1.90 (1.12–3.24) | .017 | — | 1.09 (0.80–1.50) | 1.00 (0.69–1.44) | .99 |
| Control | 5.9 | — | — | — | 14.3 | — | — | — |
| Intervention | 10.7 | — | — | — | 15.3 | — | — | — |
| Self-reported quitting among girls | — | 0.99 (0.47–2.11) | 0.94 (0.44–2.01) | .9 | — | 1.10 (0.69–1.77) | 1.08 (0.64–1.80) | .8 |
| Control | 7.0 | — | — | — | 15.5 | — | — | — |
| Intervention | 6.6 | — | — | — | 16.6 | — | — | — |
| Self-reported quitting among boys | — | 3.52 (1.76–7.04) | 3.23 (1.63–6.43) | .001 | — | 1.06 (0.65–1.72) | 0.92 (0.54–1.57) | .8 |
| Control | 4.9 | — | — | — | 13.2 | — | — | — |
| Intervention | 15.0 | — | — | — | 13.9 | — | — | — |
| Male vs female relative difference | — | 3.54 (1.37–9.16) | 3.43 (1.30–9.06) | .01 | — | 0.96 (0.47–1.96) | 0.85 (0.41–1.80) | .7 |
| Cotinine-validated quitting among all students | — | 2.63 (1.36–5.10) | 2.56 (1.35–4.86) | .004 | — | 1.39 (0.69–2.77) | 1.20 (0.56–2.58) | .6 |
| Control | 3.2 | — | — | — | 3.9 | — | — | — |
| Intervention | 7.8 | — | — | — | 5.3 | — | — | — |
| Cotinine-validated quitting among girls | — | 1.30 (0.55–3.07) | 1.35 (0.56–3.25) | .5 | — | 1.41 (0.60–3.29) | 1.38 (0.57–3.37) | .5 |
| Control | 4.3 | — | — | — | 5.3 | — | — | — |
| Intervention | 5.5 | — | — | — | 7.4 | — | — | — |
| Cotinine-validated quitting among boys | — | 5.01 (2.01–12.47) | 4.65 (1.88–11.53) | .001 | — | 1.15 (0.35–3.78) | 0.89 (0.26–3.05) | .9 |
| Control | 2.3 | — | — | — | 2.7 | — | — | — |
| Intervention | 10.4 | — | — | — | 3.1 | — | — | — |
| Male vs female relative difference | — | 3.85 (1.16–12.85) | 3.44 (1.00–11.75) | .049 | — | 0.81 (0.20–3.28) | 0.65 (0.16–2.68) | .5 |
| Cotinine-imputed quitting among all students | — | 2.52 (1.32–4.84) | 2.30 (1.22–4.33) | .01 | — | 1.61 (0.95–2.73) | 1.44 (0.79–2.62) | .2 |
| Control | 4.1 | — | — | — | 6.8 | — | — | — |
| Intervention | 9.2 | — | — | — | 10.7 | — | — | — |
| Cotinine-imputed quitting among girls | — | 1.40 (0.61–3.21) | 1.33 (0.57–3.06) | .5 | — | 1.63 (0.87–3.04) | 1.60 (0.81–3.14) | .2 |
| Control | 5.1 | — | — | — | 9.5 | — | — | — |
| Intervention | 6.6 | — | — | — | 14.8 | — | — | — |
| Cotinine-imputed quitting among boys | — | 4.24 (1.83–9.85) | 3.71 (1.62–8.51) | .002 | 1.36 (0.57–3.29) | 1.14 (0.45–2.87) | .8 | |
| Control | 3.3 | — | — | — | 4.6 | — | — | — |
| Intervention | 12.0 | — | — | — | 6.2 | — | — | — |
| Male vs female relative difference | — | 3.03 (1.03–8.91) | 2.80 (0.95–8.28) | .06 | — | 0.84 (0.31–3.28) | 0.71 (0.26–1.98) | .5 |
a
Overall model was adjusted for school. The model according to gender is adjusted for school, gender, and the interaction of gender and the intervention.
b
Overall model was adjusted for baseline self-efficacy, stage of change, smoking every day, and school, and the model according to gender was adjusted for baseline self-efficacy, stage of change, and smoking every day, school, gender, and the interaction of gender and the intervention.
Population-averaged logistic regression models were used for all analyses.