Table 1.

Contingency tables of all imaging studies 1990–2017.

Pancreatic head				Pancreatic body/tail
	Reference standard				Reference standard
	PanNET (no, %)	No PanNET (no, %)			PanNET (no, %)	No PanNET (no, %)
All imaging (n = 377)			Total	All imaging (n = 377)			Total
Index PanNET	40 (62.5)	5 (1.6)	45 (11.9)	Index PanNET	103 (72.5)	9 (3.8)	112 (29.7)
Index no PanNET	24 (37.5)	308 (98.4)	332 (88.1)	Index no PanNET	39 (27.5)	226 (96.2)	265 (70.3)
Total	64 (17.0)	313 (83.0)	377 (100)	Total	142 (37.7)	235 (62.3)	377 (100)
2010–2017 (n = 109)			Total	2010–2017 (n = 109)			Total
Index PanNET	18 (52.9)	2 (2.7)	20 (18.3)	Index PanNET	35 (76.1)	2 (3.2)	37 (33.9)
Index no PanNET	16 (47.1)	73 (97.3)	89 (81.7)	Index no PanNET	11 (23.9)	61 (96.8)	72 (66.1)
Total	34 (31.2)	75 (68.8)	109 (100)	Total	46 (42.2)	63 (57.8)	109 (100)
2000–2009 (n = 199)			Total	2000–2009 (n = 199)			Total
Index PanNET	17 (70.8)	1 (0.6)	18 (9.0)	Index PanNET	51 (71.8)	1 (0.8)	52 (26.1)
Index no PanNET	7 (29.2)	174 (99.4)	181 (91.0)	Index no PanNET	20 (28.6)	127 (99.2)	147 (73.9)
Total	24 (12.1)	175 (87.9)	199 (100)	Total	71 (35.7)	128 (64.3)	199 (100)
1990–1999 (n = 69)			Total	1990–1999 (n = 69)			Total
Index PanNET	5 (83.3)	2 (3.2)	7 (10.1)	Index PanNET	17 (68.0)	6 (13.6)	23 (33.3)
Index no PanNET	1 (16.7)	61 (96.8)	62 (89.9)	Index no PanNET	8 (32.0)	38 (86.4)	46 (66.7)
Total	6 (8.7)	63 (91.3)	69 (100)	Total	25 (36.2)	44 (63.8)	69 (100)

In the 2×2 tables, percentages are column percentages. The row “total” has row percentages; the column “total” has column percentages.

PanNET, pancreatic neuroendocrine tumor.

95% CIs are given in parentheses.

LR, likelihood ratio; NPV, negative predictive value; PPV, positive predictive value.