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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).