Quit attempts (prevalence, %) | Quit ratio (%) | Consumption (cig/day) | |||
---|---|---|---|---|---|
USA | EU | USA | USA | EU | |
Prevalence (%), bprev | −0.55±0.07*** | −0.09±0.14 | −1.13±0.06*** | 0.32±0.02*** | 0.22±0.05*** |
Centred year, bint | −0.16±0.21 | −0.56±1.94 | −0.05±0.17 | −0.15±0.06* | 0.72±0.99 |
prevalence×centred year, bslope | 0.002±0.01 | −0.04±0.06 | −0.01±0.01 | 0.001±0.003 | −0.03±0.03 |
US 1996 dummy | −3.13±0.67*** | −4.03±0.18*** | |||
constant, b0 | 44.73±1.58*** | 30.46±4.39*** | 74.12±1.28*** | 11.21±0.48*** | 8.66±1.48*** |
R2 | 0.24 | 0.26 | 0.57 | 0.76 | 0.33 |
Significance levels: *p<0.05, **p<0.01, ***p<0.001.