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Table 2 Incidence and risk of hypoxemia for individual and combinations of risk factors

From: Risk of postoperative hypoxemia in ambulatory orthopedic surgery patients with diagnosis of obstructive sleep apnea: a retrospective observational study

Number of risk factors

Risk factors combinations

Incidence of hypoxemia

(% and number of pts)

Odds

0

None

22% (20)

0.35

1

COPD

33% (1)

0.5

 

Upper extremity procedure

41% (43)

0.71

2

COPD + Upper extremity procedure

78% (7)

2.59

  1. Odds were calculated from logistic regression. Individual odds ratios can be calculated for any pair. For example the odds ratio for both risk factors versus just COPD is (2.59/0.5 = 5.18)