Multivariate Cox proportional hazards model of the factors associated with high health care costs in the last month of life before and after matching.

LSS: low socioeconomic status. O.R.: odds ratio, C.I.: confidential interval. Multivariate Cox proportional hazards model of the factors associated with high health care costs in the last month of life before and after matching.低社会经济地位（low socioeconomic status，LSS）。比值比（odds ratio，O.R.）、置信区间（confidence interval，C.I.）。匹配前后与临终前最后一个月内高额医疗费用相关影响因素的多因素Cox比例风险模型。