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Table 4 Fisher’s exact test comparison of total 30-day mortality

From: Risk stratification by pre-operative cardiopulmonary exercise testing improves outcomes following elective abdominal aortic aneurysm surgery: a cohort study

Cohort 30-day mortality (%) Odds ratio (95% CI) Pvalue
  Open surgery    
Pre-CPET (Jan 03 to Oct 07) Pre-CPET (n = 103) 12.6   
CPET era (Nov 07 to Jul 11) CPET era (total) (n = 100) 4.0 0.29 (0.09 to 0.92) P < 0.05
CPET-pass (74/100) 2.7 0.19 (0.04 to 0.88) P < 0.05
CPET-fail (8/100) 12.5 0.989 (0.11 to 8.70) P = 1.00
CPET-submaximal (3/100) 33.3 2.31 (0.22 to 23.90) P = 0.43
No-CPET (15/100) 0 0.18 (0.01 to 3.20) P = 0.21