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Total cohort mortality
| Period 1 (N=172) | Period 2 (N=138) | Period 3 (N=202) | p valuea | |
|---|---|---|---|---|
| Observed In hospital mortality | 12 (7.0 %) | 3/134 (2.2%) | 3 (1.5%) | 0.02 |
| Mean Expected In hospital mortality | 3.19% | 2.52% | 2.96% | 0.77 |
| Observed/expected ratio | 2.19 | 0.87 | 0.51 | 0.15 |
p values determined by Fisher’s exact test, rank sum or Chi-square analysis as appropriate
