Skip to main content

Table 3 Propensity score match comparison: median length of stay by complex surgery quartile

From: A cross-sectional retrospective analysis of the regionalization of complex surgery

Length of stay Matcheda Basedb Comparison Mean diff Significanced
Quartile comparison Population size Mean Std Median Mean Std Median Mean diffc Z Value Pr > |z|
1 vs. 4 2916 5.5 5.53 4 6.4 7.43 4 0.98 2.94 0.00
1 vs. 3 2476 5.7 6.53 4 6.2 5.20 4 0.56 1.73 0.08
1 vs. 2 2152 5.2 5.76 4 5.3 5.53 4 0.07 -0.08 0.93
2 vs. 4 11692 5.5 8.76 3 6.2 10.54 4 0.75 -5.43 <.001
2 vs. 3 9798 5.3 8.09 3 5.0 6.67 3 -0.29 -2.05 0.04
3 vs. 4 16205 5.8 7.47 4 6.2 8.85 4 0.41 4.98 <.001
  1. aMatched Population base divided by two = quartile population.
  2. bBase median represents the median LOS for the base quartile.
  3. cMedian difference = comparison median-base median.
  4. dSignificance test is Wilcoxon Rank Sum (2-sided).