Table 3.

Adjusted hazard ratios of all-cause mortality using Cox proportional hazards regression models with inverse probability weighting of the propensity score

	Multiple imputation of missing data			Complete data analysis
	Adjusted HR	95% CI	P value	Adjusted HR	95% CI	P value
< 75 years
Surgery alone	(reference)			(reference)
Surgery with adjuvant chemotherapy	0.56	(0.33–0.94)	0.027	0.55	(0.33–0.94)	0.028
≥75 years
Surgery alone	(reference)			(reference)
Surgery with adjuvant chemotherapy	1.07	(0.66–1.74)	0.78	1.13	(0.71–1.81)	0.60

Adjusted for sex, age at diagnosis, degree of tumor differentiation, radical surgery procedure, tumor location, body mass index, preoperative and postoperative Barthel index, comorbidities, and postoperative complications

CI, confidence interval; HR, hazard ratio