Table 4

Individual site and four-site regression models

	IPOPAE				IPOPAEGP
	Individual-site regression		Four-site regression		Individual-site regression		Four-site regression
	True-positives	PPV	True-positives	PPV	True-positives	PPV	True-positives	PPV
Newham
Risk score 50+	734	0.552	858	0.517	768	0.566	835	0.523
Risk score 30+	1409	0.450	1564	0.414	1570	0.439	1798	0.409
Cornwall
Risk score 50+	1041	0.520	754	0.548	1176	0.545	952	0.556
Risk score 30+	2439	0.406	1970	0.426	3032	0.410	2746	0.411
Kent
Risk score 50+	1565	0.513	1387	0.519	1736	0.521	1873	0.493
Risk score 30+	3372	0.401	3067	0.403	4079	0.397	4432	0.369
Croydon
Risk score 50+	1089	0.528	1192	0.523	1182	0.550	1230	0.537
Risk score 30+	2134	0.444	2258	0.424	2610	0.442	2502	0.437
Redbridge
Risk score 50+	743	0.512	863	0.495	807	0.522	607	0.519
Risk score 30+	1656	0.420	1693	0.415	1905	0.423	1390	0.436

Case finding and predictive accuracy.
PPV, positive predictive values.