Relative risks (RR) of mortality among the homeless population due to cold and heat stress (exposed group) in comparison to thermoneutral conditions (control group).

The RR and 95% confidence interval (CI) are calculated according to Altman 1991 [29].相对危险度（Relative Risk，RR）及95%置信区间（Confidence Interval，CI）的计算方法参照Altman于1991年发表的文献[29]。