Table 6.

Estimation of the hazard ratio for overall survival

Study	HR estimation	Co-factors	Analysis results
Osawa [19]	HR, 95 % CI	Histology, no. of positive LNs, adjuvant chemotherapy	Significant
Guzzo [22]	HR, 95 % CI	Age, sex, diversion type, pT stage, adjuvant chemotherapy	Not significant
Stephenson [23]	HR, 95 % CI	pT stage, aggregate LN metastasis diameter, lymphovascular invasion, margin status, extracapsular extension	Not significant
Morgan [26]	HR, 95 % CI	Age, Charlson comorbidity index, pT stage, tumor grade, no. of LNs removed, adjuvant chemotherapy, diversion type, year of surgery, surgeon volume, transfusion	Significant
Mmeje [29]	P value, event no. (univariate)	-	Not significant

HR: hazard ratio, CI: confidence interval, LN: lymph node