Table 3.
Parameter estimates, overall exposure effect estimates and the standard errors (SE) or 95% Confidence Intervals (CIs) from the mixture cure models for the smoking cessation data.
| 3 d.f. RCS model Approximation |
Piecewise Linear Approximation |
|||||||
|---|---|---|---|---|---|---|---|---|
| Logistic model | Survival model | Logistic model | Survival model | |||||
| Estimate | SE | Estimate | SE | Estimate | SE | Estimate | SE | |
| Intercept | 0.2608 | 1.1513 | - | - | 1.7668 | 2.0563 | - | - |
| Sex (male = 0) | 0.4057 | 0.4072 | 0.2734 | 0.4529 | 0.1170 | 0.6243 | 0.5215 | 0.5054 |
| Duration as smoker | −0.0701 | 0.0494 | 0.0626 | 0.0395 | −0.1291* | 0.0630 | 0.0799* | 0.0358 |
| Cigarettes/day | 0.0606 | 0.0498 | −0.0698* | 0.0265 | 0.0874 | 0.0461 | −0.0563* | 0.0281 |
| SI vs. UC (usual care = 0) | −0.7354 | 0.4433 | 0.2524 | 0.5454 | −0.5391 | 0.6021 | −0.1651 | 0.5271 |
| Overall Exposure (SI) Effect on RMST, year† | 0.299 (−0.203, 0.732) | 0.320 (−0.139, 0.778) | ||||||
†
: assessed at last observed time.
*
: p < 0.05.