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 |