Table 5.
Simulated change in O/E ratios based on per cent of cases coded as contaminated, for various baseline performance
| Per cent cases coded as contaminated (versus clean-contaminated) | Hypothetical baseline O/E performance |
Percent change in O/E ratio | ||
|---|---|---|---|---|
| High performer 0.67 | Average performer 1.0 | Poor performer 1.5 | ||
| 0% | 0.69 | 1.03 | 1.54 | 2.1% |
| 6.8% (baseline) | 0.67 | 1.00 | 1.50 | 0.0% |
| 10% | 0.66 | 0.99 | 1.48 | −0.8% |
| 20% | 0.65 | 0.97 | 1.46 | −3.6% |
| 30% | 0.64 | 0.96 | 1.43 | −6.2% |
| 40% | 0.63 | 0.94 | 1.41 | −8.6% |
| 50% | 0.62 | 0.92 | 1.39 | −11.0% |
| 60% | 0.61 | 0.91 | 1.36 | −13.2% |
| 70% | 0.60 | 0.90 | 1.34 | −15.3% |
Modelled based on observed rates of SSI and wound classification reporting for HPB cases in NSQIP; changes in O/E ratio reflect approximate changes predicted using traditional NSQIP logistic regression risk-adjustment model.
SSI, surgical site infection; O/E ratio, observed-to-expected ratio.