Table 1. Regression discontinuity analysis of the change in incidence of medical conditions with enforcement of tobacco control legislation,a Chile, 2011–2014.
| Medical condition | Demographic group | Regression discontinuity model coefficients |
||
|---|---|---|---|---|
| Discrete change in disease rate b |
Change in temporal trend in disease rate c |
|||
| Value (95% CI) | Value (95% CI) | |||
| Myocardial infarction | Both sexes, aged ≥ 20 years | –0.639 (–1.036 to –0.242) | –0.043 (–0.071 to –0.016) | |
| Myocardial infarction | Males, aged ≥ 20 years | –0.778 (–1.462 to –0.095) | –0.069 (–0.117 to –0.022) | |
| Myocardial infarction | Females, aged ≥ 20 years | –0.514 (–0.941 to –0.086) | –0.023 (–0.053 to 0.006) | |
| Myocardial infarction | Both sexes, aged 20–69 years | –0.363 (–0.725 to –0.001) | –0.021 (–0.046 to 0.004) | |
| Myocardial infarction | Both sexes, aged ≥ 70 years | –3.508 (–6.317 to –0.698) | –0.300 (–0.495 to –0.105) | |
| Ischaemic stroke | Both sexes, aged ≥ 20 years | –0.188 (–1.073 to 0.697) | –0.084 (–0.145 to –0.022) | |
| Degenerative disc disease | Both sexes, aged ≥ 20 years | 0.124 (–0.422 to 0.669) | –0.019 (–0.057 to 0.019) | |
| Colon cancer | Both sexes, aged ≥ 20 years | –0.112 (–0.421 to 0.197) | 0.025 (0.004 to 0.047) | |
| Myocardial infarction in the Santiago metropolitan aread | Both sexes, aged ≥ 20 years | –0.733 (–1.272 to –0.195) | –0.053 (–0.091 to –0.015) | |
CI: confidence interval.
a A second round of strengthened tobacco control legislation took effect on 1 March 2013.
b The parameter γ indicates the discrete change in disease rate associated with the enforcement of smoking legislation in March 2013.
c The parameter δ indicates the change in the temporal trend of the disease rate associated with the enforcement of smoking legislation in March 2013.
d An additional regression discontinuity model for the Santiago metropolitan area included the daily concentration of particulate matter in the air smaller than 2.5 micrometres (PM2.5).