Table 3.

Age distribution

Age group (in years)	Total = 650	Grade 0	Grade 1	Grade 2	Grade 3	Grade 4
20–30	26 (4%)	5	10	8	2	1
31–40	74 (11.4%)	2	25	35	9	3
41–50	205 (31.5%)	3	112	41	32	17
51–60	175 (26.9%)	1	77	50	28	19
61–70	129 (19.9%)	0	49	40	24	16
71–80	34 (5.2%)	0	2	4	18	10
81–90	7 (1.1%)	0	0	1	2	4