Fig. 2

Kaplan–Meier survival curves for the two groups before propensity-score weighting. These unweighted Kaplan–Meier curves showed the overall survival of elderly patients with advanced gastric cancer treated with either the oxaliplatin-based or the cisplatin-based regimens. The median overall survival before propensity score weighting was 10.5 months (95% confidence interval, 8.5 - Not Available months) in the oxaliplatin-based and 11.3 months (95% confidence interval, 9.9–15.6 months) in the cisplatin-based treatment groups