Table 4.
Hazard ratio approximations (95% CIs) from cumulative failure time (CFT) and accelerated failure time (AFT) models for the exposure Long Haul drivers.
| HR approx.a | |
|---|---|
| All-cause Mortality | |
| CFT model | 1.43 (1.24 – 1.66) |
| AFT model | 1.34 (1.15 – 1.59) |
| IHD Mortality | |
| CFT model | 1.38 (1.08 – 1.82) |
| AFT model | 1.39 (1.05 – 1.84) |
b
HR approximation from CFT model Risk Ratio estimate, is the conditional HR at time t ∈(k, k+1] (assumed to approximate the marginal HR) for the effect of exposure up to year k, compared to exposure up to year k-1 and unexposed afterwards
HR approximation from the AFT model based on Weibull distribution assumption for survival time T, and approximates the HR comparing “always” exposed to “never exposed” at time t.