Table 3. Effect of concurrent chemotherapy regimens on OS and PFS in esophageal cancer patients receiving chemoradiotherapy.

Model	Sample size	OS			PFS
		HR	95% CI	P value	HR	95% CI	P value
Unadjusted	161 vs. 156	0.697	0.528-0.920	0.011	0.784	0.599-1.027	0.077
Propensity score–based models
Stratified	161 vs. 156	0.677	0.493-0.928	0.016	0.751	0.553-0.945	0.036
Weighted (IPTW)	161 vs. 156	0.700	0.577-0.851	0.003	0.759	0.628-0.918	0.014
Matcheda	102 vs.102	0.641	0.464-0.887	0.007	0.663	0.474-0.928	0.016

Abbreviations: OS, overall survival; PFS, progression-free survival; HR, hazard ratio; CI, confidence interval; IPTW, inverse probability of treatment weighting.

^aAdjusted hazard was derived from the Cox proportional hazards marginal structural model.