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Table 3 Multivariate model output from backward stepwise selection model including only variables that are significant at (p < 0.01) in the multivariate model

From: The Marsden Morbidity Index: the derivation and validation of a simple risk index scoring system using cardiopulmonary exercise testing variables to predict morbidity in high-risk patients having major cancer surgery

Variable OR (95% CI) p-value
VO2 max (continuous) 0.82 (0.77–0.86) < 0.001
AT (continuous) 0.66 (0.61–0.71) < 0.001
AT VE/VCO2 (continuous) 1.33 (1.26–1.40) < 0.001
COPD
 No 1 0.001
 Yes 1.99 (1.33–2.98)  
Chronic renal impairment
 No 1 < 0.001
 Yes 7.50 (4.29–13.10)  
Age group
  > 70 years 1 0.001
 51–70 years 0.35 (0.18–0.69) 0.003
 < 50 years 0.25 (0.12–0.51) < 0.001
Diabetic status
 Negative 1 0.002
 Insulin 2.54 (1.52–4.23) < 0.001
 Non-insulin dependent 1.02 (0.98–1.06) 0.831
BMI categories
 < 18.5 6.98 (2.91–16.74) < 0.001
 18.5–24.99 1 < 0.001
 ≥ 25.0 1.72 (0.90–3.30) 0.102
Surgery type
 Robotic/laparoscopic 1 < 0.001
 Open 10.80 (5.77–20.19)  
Cancer stage
 Primary 1 0.006
 Local nodal metastases 1.61 (0.84–3.09) 0.153
 Distant metastases 11.22 (2.31–54.66) 0.003
WHO category
 0 1 < 0.001
 ≥ 1 3.94 (2.58–6.03)  
Prior TIA/stroke
 No 1 0.002
 Yes 3.07 (1.50–6.31)