Table 2. Discrete-Time Complementary loglog (cloglog) Duration Models of Smoking Initiation Among Individuals Aged 16 to 19 Years at Interviewa.
| Variable | Model 1 | Model 2 | Model 3 | Model 4 | Model 5 |
|---|---|---|---|---|---|
| Own-price elasticities, estimate (95% CI)b | |||||
| All | −0.36 (−0.40 to −0.32) | −0.37 (−0.41 to −0.33) | −0.36 (−0.40 to −0.32) | −0.40 (−0.44 to −0.35) | −0.40 (−0.45 to −0.36) |
| Sex | |||||
| Female | NA | −0.27 (−0.32 to −0.22) | NA | NA | −0.30 (−0.36 to −0.25) |
| Male | NA | −0.47 (−0.52 to −0.42) | NA | NA | −0.50 (−0.56 to −0.45) |
| Mother’s educational level | |||||
| Primary or less | NA | NA | −0.37 (−0.44 to −0.30) | NA | −0.41 (−0.48 to −0.34) |
| Secondary or less | NA | NA | −0.40 (−0.45 to −0.35) | NA | −0.44 (−0.49 to −0.38) |
| More than secondary | NA | NA | −0.32 (−0.38 to −0.26) | NA | −0.36 (−0.42 to −0.30) |
| School | |||||
| Public | NA | NA | −0.37 (−0.42 to −0.31) | NA | −0.41 (−0.47 to −0.35) |
| Subsidized | NA | NA | −0.40 (−0.45 to −0.34) | NA | −0.44 (−0.50 to −0.38) |
| Private | NA | NA | −0.26 (−0.36 to −0.17) | NA | −0.30 (−0.39 to −0.20) |
| Law 20105 | |||||
| Before | NA | NA | NA | −0.44 (−0.50 to −0.38) | −0.45 (−0.51 to −0.40) |
| After | NA | NA | NA | −0.30 (−0.35 to −0.25) | −0.30 (−0.35 to −0.25) |
| Law 20105 (August 2006), HR (95% CI) | |||||
| All | 0.85 (0.83 to 0.87) | 0.85 (0.83 to 0.87) | 0.85 (0.83 to 0.87) | 0.83 (0.81 to 0.85) | 0.83 (0.81 to 0.85) |
| Sex | |||||
| Female | NA | 0.80 (0.78 to 0.83) | NA | NA | 0.78 (0.76 to 0.81) |
| Male | NA | 0.90 (0.88 to 0.93) | NA | NA | 0.88 (0.85 to 0.91) |
| Mother’s educational level | |||||
| Primary or less | NA | NA | 0.90 (0.85 to 0.93) | NA | 0.86 (0.83 to 0.91) |
| Secondary or less | NA | NA | 0.87 (0.84 to 0.90) | NA | 0.84 (0.82 to 0.88) |
| More than secondary | NA | NA | 0.80 (0.77 to 0.83) | NA | 0.79 (0.76 to 0.82) |
| School | |||||
| Public | NA | NA | 0.88 (0.85 to 0.92) | NA | 0.86 (0.83 to 0.90) |
| Subsidized | NA | NA | 0.85 (0.82 to 0.88) | NA | 0.83 (0.80 to 0.86) |
| Private | NA | NA | 0.78 (0.73 to 0.83) | NA | 0.76 (0.71 to 0.81) |
Abbreviations: HR, hazard ratio; NA, not applicable.
a
All models adjusted for regions; time dependence modeled using a cubic polynomial; SEs clustered at the school level; number of observations, 15 177 836; number of individuals, 181 624; and number of failures, 135 019.
b
Own-price elasticity is a measure of the responsiveness of the demand for a good to a change in its own price; more precisely, it represents the percentage change in quantity demanded in response to a 1% change in price.