Improving polyp detection at colonoscopy: Non-technological techniques

Table 2 Results of studies evaluating colonic withdrawal times

Ref.	Intervention limb, %	Control limb, %	P value
Barclay et al[17]	28.3%	11.8%	< 0.001
Barclay et al[18]	34.7%	23.5%	> 0.0001
Sawhney et al[19]	NA	NA	NA
Gellad et al[27]	NA	NA	NA
Gromski et al[21]	32.3%	9.5%	< 0.001
Moritz et al[24]	NA	NA	NA
Lee et al[20]	47.1%	42.5%	< 0.001
Butterly et al[28]	ADR: IRR = 1.50		0.001
Zhao et al[29]	36.6%	27.1%	0.001

ADR: Adenoma detection rate; IRR: Incidence rate ratio; NA: Not available.