Table 5.

Tables and accuracy measures for different case definition algorithms

Colorectal cancer
Operative unit	Algorithm	TP	FP	TN	FN	Sensitivity	Specificity	PPV
Umbria	Case definition 1: lesion and histology	211	45	183	1	100	80	82
	Case definition 2: case definition 1+chemotherapy or radiotherapy	214	42	183	1	100	81	84
	Case definition 3: case definition 2+metastasis	220	36	183	1	100	84	86
	Case definition 4: case definition 3+subsequent medical chart	225	33	183	1	100	85	87
ASL Napoli 3 Sud	Case definition 1: lesion and histology	193	47	186	2	99	80	80
	Case definition 2: case definition 1+chemotherapy or radiotherapy	197	43	186	2	99	81	82
	Case definition 3: case definition 2+metastasis	206	34	186	2	99	85	86
	Case definition 4: case definition 3+subsequent medical chart	217	23	186	2	99	89	90
Friuli Venezia Giulia	Case definition 1: lesion and histology	208	51	184	4	98	78	80
	Case definition 2: case definition 1+chemotherapy or radiotherapy	209	50	184	4	98	79	81
	Case definition 3: case definition 2+metastasis	213	46	184	4	98	80	82
	Case definition 4: case definition 3+subsequent medical chart	238	21	184	4	98	90	92

PPV, positive predictive value; ASL, Azienda Sanitaria Locale; TP, True positive; FP, False positive; TN, True negative; FN, False negative.