Mean daily and maximum daily cigarette consumption for each smoking category
| Wave 1 At school | Wave 2 3 Months after school | Wave 3 9 Months after school | Wave 4 15 Months after school | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | (95% CIs) | n | Mean | (95% CIs) | n | Mean | (95% CIs) | n | Mean | (95% CIs) | n | ||||
| Occasional smokers | |||||||||||||||
| Daily consumption | 0.74 | (0.59–0.89) | 199 | 0.86 | (0.68–1.04) | 208 | 0.85 | (0.62–1.08) | 213 | 1.03 | (0.71–1.35) | 182 | |||
| Maximum consumption | — | 3.34 | (2.65–4.03) | 3.36 | (2.72–4.00) | 3.10 | (2.45–3.75) | ||||||||
| Light smokers | |||||||||||||||
| Daily consumption | 4.27 | (3.79–4.75) | 160 | 5.97 | (5.19–6.75) | 166 | 5.71 | (5.01–6.41) | 177 | 7.71 | (6.52–8.90) | 168 | |||
| Maximum consumption | — | 11.43 | (10.31–12.55) | 11.55 | (9.85–13.25) | 11.97 | (10.83–13.11) | ||||||||
| Heavy smokers | |||||||||||||||
| Daily consumption | 10.81 | (9.56–12.06) | 83 | 14.21 | (12.85–15.57) | 116 | 15.29 | (13.88–16.70) | 138 | 16.97 | (15.56–18.38) | 142 | |||
| Maximum consumption | — | 22.94 | (20.99–24.89) | 22.39 | (20.66–24.12) | 24.24 | (22.40–26.08) | ||||||||
CI = confidence interval.