Four continuous covariates (age in years, hospital stay in days, duration of surgery in minutes, body mass index) were available.
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资源简介：
The description of the continuous covariates (number of observations, number of missing observations, mean, standard deviation and range) was split into the surgery date cohorts. P-values of the Mann-Whitney test for a difference of the means between the cohorts are printed in the first column.
创建时间：
2013-11-14
