Systematic Review: Outcomes by Duration of NPO Status prior to Colonoscopy

Table 1

Summary of baseline characteristics.

Characteristic	Mean (range); Unless otherwise noted	Number of studies reported
Total number of patients evaluated	22,936 (80 to 5175)	40
Randomized controlled trials, number of patients	9304 (80 to 895)	28
Controlled clinical trials, number of patients	740 (328 to 412)	2
Observational studies, number of patients	12,892 (100 to 5175)	10
Age of subjects, years (range of means)	57 (44 to 63)	34
Age of subjects, years (range of medians)	55 to 65	3
Gender, male, %	46 (28 to 81)	38
Indication for colonoscopy screening, %	61 (0^a to 100)	20
Location—USA/Canada, number of patients	12,208 (100 to 5175)	17
Location—Asia/Australia, number of patients	8045 (80 to 3079)	14
Location—Europe, number of patients	2683 (160 to 895)	9

^aTwo studies reported that screening was not an indication for colonoscopy. Chiu et al. [20] included participants who had colorectal neoplasms detected at a screening colonoscopy and were scheduled for a second colonoscopic examination for either elective polypectomy or endoscopic mucosectomy. Manno et al. [41] included participants with a positive fecal occult test or those in surveillance postpolypectomy.