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Table 3 Mann–Whitney U comparison of length of stay for open and endovascular AAA repairs

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

Cohort Median total length of stay (days) (95% CI) Pvalue Median length of ITU stay (days) (95% CI) Pvalue
Open surgery      
Pre-CPET (n = 103)   13 (13.9 to 19.0)   4 (5.5 to 11.2)  
CPET era (n = 100) CPET-era open (100/100) 10 (10.3 to 13.5) P < 0.001 3 (3.2 to 4.4) P < 0.01
CPET-pass (74/100) 10 (10.6 to 14.9) P < 0.01 3 (2.9 to 4.3) P < 0.001
CPET-fail (8/100) 11.5 (8.6 to 3.9) P = 0.25 4.95 (2.1 to 8.4) P = 0.88
CPET-submaximal (3/100) 11 (−5.4 to 22.0) P = 0.18 11 (−5.3 to 22.0) P = 0.59
No-CPET (15/100) 8 (6.6 to 11.1) P < 0.001 5 (3.1 to 6.1) P = 0.82
EVAR a      
Pre-CPET (n = 25)   6 (5.3 to 8.6)   N/A N/A
CPET era (n = 69) CPET-era EVAR (69/69) 4 (4.6 to 6.7) P < 0.05 N/A N/A
CPET-pass (29/69) 4 (3.6 to 5.7) P < 0.05 N/A N/A
CPET-fail (7/69) 4 (2.5 to 8.1) P = 0.23 N/A N/A
CPET-submaximal (6/69) 4 (0 to 14.3) P = 0.56 N/A N/A
No-CPET (27/69) 4 (4.4 to 8.8) P = 0.14 N/A N/A
  1. a Insufficient EVAR patients required ITU management for reasonable comparison.