共同的相对危险率和95%的可信区间用一种随机效应模型被计算出来。

Pooled relative risk (RR) and 95% confidence interval (CI) were calculated using a random-effects model.

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以治疗级别的逆概率计算后4个时段与第一个时段的住院死亡率的相对危险度。

The relative risk of in-hospital mortality when the four later periods were compared with the earliest one was estimated with inverse probability of treatment-weighted analysis.

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