We surveyed 1625 consecutive patients for relevant covariates.

我们调查了1625个连续病例相关指标。

Covariates Zheng Hong cen, not to regret, but paves the way for progress.

郑宏岑，反是不思去后悔，而是为前进铺路。

There were no differences in baseline covariates between groups (P > . 05).

两组间基线指标无差异（P>0.05）。

This method is easy to implement, but it only accommodates discrete covariates .

该方法的缺点是：考虑的协变量只能是分类变量。

It is so called "time-dependent covariates" that the values of covariates change over time.

共变数的值会随著时间而改变时，我们称之为时间相依之共变数。