2.5. Statistical methods
MRS
Continuous variables are expressed as the means and standard deviations or medians with the 25th and 75th percentiles. The compromise between the 2 groups was compared by The GEE model was used to compare the differential changes in each outcome (MRS) at the time point 3 months after discharge (T2) to the time point of discharge (T1) between groups, with adjustment for the covariates identified as described above. The time and group interaction term (Group*Time) was used to measure the differential change in each variable across time points between the groups. All tests were 2-sided; results with 