Adenoma and advanced neoplasia detection rates increase from 45 years of age

Table 2 Comparison of patients’ characteristics, colonoscopy data and detection rates in patients aged 45-49 years and over 50 years n (%)

		45-49 yr (n = 515)	≥ 50 yeas (n = 4436)	P value
Gender, male/female, n		236/279	2028/2408	0.98
Indications for colonoscopy
Patients without symptoms		268 (52)	3,006 (68)	< 0.001
High risk
	Personal or family history of polyps	204 (39.6)	2082 (46.9)	0.002
Average risk		311 (60.4)	2354 (53)	< 0.001
	Digestive symptoms	247 (48)	1430 (32.2)
	Other	64 (12.4)	924 (20.8)
Colonoscopy data
Sub-optimal preparation		30 (5.8)	275 (6.2)	0.84
Mean number of polyps		0.47	0.78	-
Median withdrawal time, s		452	471	0.49
Histological data
Polyp detection rate, %		29.1	40	< 0.001
Adenoma detection rate, %		21.2	34.6	< 0.001
Serrated polyp detection rate, %		11.7	10.1	0.32
Advanced neoplasia detection rate, %		6.4	11.8	< 0.001