Differences in characteristics of colorectal neoplasm between young and elderly Thais

Table 1 General characteristics of patients

Characteristic	Men	Women	Total
n	788	1034	1822
Mean age (yr)	56.4	56.7	56.6
Age range (yr)	14-91	14-100	14-100

Table 2 Age groups and colonoscopic findings

Colonoscopic	Younger age group	Older age group	Total
finding	(< 60 yr) (%)	(≥60 yr) (%)	n	%
Normal	42.9	33.6	704	38.6
Colorectal polyps	12.8	25.2	337	18.5
-colorectal adenoma	7.0	14.0	185	10.5
-nonadenoma	5.8	11.2	152	8.0
Colorectal cancer	5.1	7.1	109	6.0
IBD	2.4	1.0	33	1.8
Other diagnoses	36.8	33.0	639	35.1
Total (%)	100	100		100
N	989	833	1822

Table 3 Age groups and site distribution of “colorectal malignancy related lesions”

Cancer site	Younger age group	Older age group	Total
	(< 60 yr) (%)	(≥60 yr) (%)	n	%
Right-sided	37.5	39.3	115	38.6
adenoma	20.3	29.1	75	24.7
cancer	17.2	10.2	40	13.7
Left-sided	62.5	60.7	180	61.4
adenoma	38.7	37.1	110	37.9
cancer	23.8	22.9	70	23.5
Total (%)	100	100	-	100
N	120	175	295	-

Table 4 Locations of colorectal malignancy related lesions and indication for colonoscopy in elderly patients

Indication	Right-sided	Left-sided	Total
	lesions (%)	lesions (%)	n	%
Anemia	20.0	18.5	34	19.1
Abnormal radiography	4.3	0.9	4	2.2
Bowel habit change	41.4	29.6	61	34.3
Family history	5.7	1.9	6	3.4
Stool occult blood positive	1.4	5.6	7	3.9
Abdominal mass	2.9	6.5	9	5
Abdominal pain	2.9	6.5	9	5
Hematochezia	5.7	22.2	27	15.7
Check-up	12.9	5.6	13	8.4
Weight loss	2.9	2.8	5	2.8
Total (%)	100	100		100
N	69	106	175

Table 5 Cancer staging by age groups

Cancer	Younger age group	Older age group	Total
staging	(< 60 yr) (%)	(≥60 yr) (%)	n	%
Duke A	14.3	13.6	15	13.9
Duke B	46.9	40.7	47	43.5
Duke C	8.2	23.7	18	16.7
Duke D	30.6	22.0	29	25.9
Total (%)	100	100		100
N	50	59	109