Colonoscopy can miss diverticula of the left colon identified by barium enema

Table 1 Patient characteristics (n = 65)

Sex (male/female)	40/25
Mean age (IQR)	73 (66–78)
Median duration (IQR) between the onset of hematochezia and colonoscopy	4 (2–8)
Cause of hematochezia
Colonic diverticular bleeding	30
Colon cancer (cecum/ascending/transverse/sigmoid colon)	19 (3/8/2/6)
Rectal cancer	14
Unknown	2

IQR: Interquartile range.

Table 2 Diagnostic value of colonoscopy for colonic diverticula in 65 patients

Number1	Sens, % (95%CI)	Spec, % (95%CI)	LR (+) (95%CI)	LR (-) (95%CI)	ROC-AUC (95%CI)	P value
All (44/21)	91 (79-98)	90 (67-99)	8.7 (2.3-32)	0.097 (0.038-0.52)	0.90 (0.82-0.99)
Age (yr)
< 70 (18/9)	90 (67-99)	88 (47-100)	7.2 (1.1-45)	0.12 (0.032-0.46)	0.89 (0.74-1)
≥ 70 (26/12)	93 (76-99)	91 (59-100)	10 (1.6-66)	0.082 (0.021-0.31)	0.92 (0.82-1)	0.68
Sex
Female (13/12)	100 (72-100)	86 (57-98)	5.8 (1.8-18)	0.05 (0.0033-0.76)	0.93 (0.83-1)
Male (31/9)	89 (73-97)	100 (48-100)	11 (0.74-150)	0.14 (0.056-0.33)	0.94 (0.89-1)	0.47
Location
Right colon (40/25)	95 (84-99)	96 (79-100)	23 (3.4-156)	0.051 (0.013-0.20)	0.96 (0.90-1)
Left colon (26/39)	66 (49-80)	96 (81-100)	18 (2.6-123)	0.36 (0.23-0.56)	0.81 (0.73-0.90)	0.02

¹With/without diverticulosis. P values were calculated using the receiver operating characteristic curve area under the curve (ROC-AUC) for comparisons in this category. Sens: Sensitivity; Spec: Specificity; LR: Likelihood ratio.