Table 7. One-tailed [zeta] statistics [*]for selected differences in percentages of survival rates

Comparison1 Year3 Years5 Years
CHD vs. PPH1.361.341.08
CHD vs. ES2.99 [|] 3.00 [|] 3.33 [|]
CHD vs. CF2.78 [|] 3.41 [|] 4.44 [|]
PPH vs. ES2.392.44 [|] 3.16 [|]
PPH vs. CF2.10 [||] 2.89 [|] 2.94 [||]

* Using a one-tailed [zeta] statistic test for difference of percentages, it was found that patients with congenital heart disease (CHD) or primary pulmonary hypertension (PPH) each have a significantly worse survival rate after a heart-lung transplant at 1-, 3-, and 5-year intervals than those having Eisenmenger's syndrome (ES) or cystic fibrosis (CF). However, no significant difference was found between the survival rates of patients having a diagnosis of CHD vs. those with PPH.

| The critical value for a one-tailed z statistic at the. 01 level of significance is approximately 2.395.

|| The critical value for a one-tailed z statistic at the .05 level of significance is approximately 1.645.

From: Institutional and Patient Criteria for Heart-Lung Transplantation

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