Table 3 Prediction accuracies of the four models varied according to risk cutoff points for defining a positive screening result.

Models	Risk score threshold (%)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Accuracy (%)	Detection prevalence (%)	Balanced accuracy (%)
Full	≥ 2	0.841	0.895	0.16	0.996	0.894	0.122	0.868
	≥ 5	0.795	0.928	0.207	0.995	0.925	0.089	0.862
	≥ 10	0.75	0.943	0.237	0.994	0.938	0.073	0.846
Pre-operative	≥ 2	0.864	0.9	0.17	0.996	0.899	0.118	0.882
	≥ 5	0.841	0.926	0.211	0.996	0.924	0.092	0.883
	≥ 10	0.795	0.94	0.24	0.995	0.937	0.077	0.868
Operative	≥ 2	0.909	0.883	0.156	0.998	0.884	0.135	0.896
	≥ 5%	0.864	0.922	0.208	0.997	0.92	0.096	0.893
	≥ 10%	0.841	0.938	0.243	0.996	0.936	0.08	0.889
Simple	≥ 2%	0.909	0.877	0.149	0.998	0.878	0.141	0.893
	≥ 5%	0.841	0.929	0.219	0.996	0.927	0.089	0.885
	≥ 10%	0.795	0.94	0.238	0.995	0.936	0.077	0.868

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