Table 2.

Frequency of various types of gallstones according to age

Age group (years)	CS	MS	PS	Total
≤20	0	0	1	1
21–30	2	2	5	9
31–40	5	5	2	11
41–50	2	4	6	12
51–60	1	3	1	5
≥61	1	0	1	2
	11	14	16	41

Note: CS, cholesterol stones; MS, mixed stones; PS, pigment stones.