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. Author manuscript; available in PMC: 2018 Jun 1.
Published in final edited form as: Can J Stat. 2017 Apr 13;45(2):202–219. doi: 10.1002/cjs.11317

Table 5.

Estimation results by Cox models using the cohorts from the SEER-Medicare linked data. HR: hazard ratio; SE: standard error

Incident cohort Combined cohort
HR SE P-value HR SE P-value
Radiation effect without adjusting by propensity score* 0.657 0.033 < 0.001 0.700 0.028 < 0.001
Radiation effect adjusted by propensity score 0.756 0.045 < 0.001 0.748 0.030 < 0.001
*

the model does not include covariates X.