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Table 2 Propensity score match comparison: hospital mortality by complex surgery quartile

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

Mortality Matcheda Basedb Comparison Base (%) Comparison (%) Significance
Quartile comparison Population size Mortalities Mortalities Mortality R Mortality R Chi2 Pr > |Chi2
1 vs. 4 2916 20 15 1.4 1.0 0.72 0.39
1 vs. 3 2476 12 15 1.0 1.2 0.33 0.56
1 vs. 2 2152 11 8 1.0 0.7 0.47 0.48
2 vs. 4 11692 49 68 0.8 1.2 3.11 0.07
2 vs. 3 9798 44 40 0.9 0.8 0.19 0.66
3 vs. 4 16205 97 222 2.4 2.7 1.51 0.21
  1. Abbreviation: Mortality R Mortality Rate.
  2. aMatched Population base divided by two = quartile population.
  3. bBase mean represents the average mortality rate for the base quartile.