Table 3 Hazard ratios (HR) with 95% confidence intervals (CI) from Cox regressions with shared frailty

Certification only

0.93***

(0.90,0.96)

0.86***

(0.83,0.89)

Certification, age, sex

0.94***

(0.91,0.96)

0.88***

(0.86,0.91)

Certification, age, sex, metastases, secondary malignoma, comorbidities

0.89***

(0.87,0.92)

0.88***

(0.85,0.90)

Certification, age, sex, metastases, secondary malignoma, comorbidities, hospital characteristics

0.88***

(0.86,0.91)

0.88***

(0.85,0.92)

Certification, age, sex, metastases, secondary malignoma, comorbidities, hospital characteristics, calendar year dummies

0.92***

(0.89,0.95)

0.90***

(0.87,0.94)