Sensitivity and inter-observer variability for capsule endoscopy image analysis in a cohort of novice readers

Table 1 Gold standard findings and time intervals

Location	Case	Time intervals	Findings
1	1	22 500–32 900	Aphthous ulceration (from NSAIDS use)
2	2	4 542–6 842	Aphthous ulceration (from NSAIDS use)
3	3	16 144–16 157	Duodenal bleeding (AVM)
4	4	25 302–25 372	Staples and ulcerations (from prior Surgery)
5	5	24 244–24 700	Small bowel tumor
6	6	23 596–23 692	Aphthous ulceration (from Crohn’s disease)
7	7	32 657–50 000	Radiation enteritis
8	8	20 000–26 000	Chicken bone
9	9	1350–2434	Bleeding angiodysplasia
10	10	12 600–12 800	Bleeding angiodysplasia

Table 2 Findings and sensitivity

Reader number	Case 1	Case 2	Case 3	Case 4	Case 5	Case 6	Case 7	Case 8	Case 9	Case 10	Total findings	Sensitivity
1	1	1	0	1	1	1	1	0	1	1	8	0.8
2	1	1	1	0	0	1	1	1	1	1	8	0.8
3	1	1	1	0	0	1	1	1	1	1	8	0.8
4	1	1	1	1	1	0	0	1	1	1	8	0.8
5	1	1	0	0	1	0	0	1	1	1	6	0.6
6	0	1	1	1	0	1	1	1	0	1	7	0.7
7	1	1	1	1	1	0	1	1	1	1	9	0.9
8	1	1	1	1	1	1	1	1	1	1	10	1
9	1	1	1	1	0	0	1	1	1	1	8	0.8
10	1	1	1	1	1	0	1	1	1	0	8	0.8
Overall	9	10	8	7	6	5	8	9	9	9	80	0.8

Average sensitivity = 80%.

Table 3 False positive/incidental findings

Reader number	Case 1	Case 2	Case 3	Case 4	Case 5	Case 6	Case 7	Case 8	Case 9	Case 10	Total findings	Sensitivity
1	1	1	0	1	1	1	1	0	1	1	8	0.8
2	1	1	1	0	0	1	1	1	1	1	8	0.8
3	1	1	1	0	0	1	1	1	1	1	8	0.8
4	1	1	1	1	1	0	0	1	1	1	8	0.8
5	1	1	0	0	1	0	0	1	1	1	6	0.6
6	0	1	1	1	0	1	1	1	0	1	7	0.7
7	1	1	1	1	1	0	1	1	1	1	9	0.9
8	1	1	1	1	1	1	1	1	1	1	10	1
9	1	1	1	1	0	0	1	1	1	1	8	0.8
10	1	1	1	1	1	0	1	1	1	0	8	0.8
Overall	9	10	8	7	6	5	8	9	9	9	80	0.8

Average sensitivity = 80%.