TABLE 1.

Sample stratification for age, education, and sex.

M/F	Age
Education	30≤	31–45	46–60	61–70	71–80	≥81	Total
5≤	0/0	0/0	0/0	1/3	1/2	6	3/11
6–8	5/0	2/2	8/13	4/2	4/3	2/3	25/23
9–12	1/1	0/1	2/11	4/6	2/2	1/1	10/22
13–16	34/28	8/11	20/39	4/13	1/3	0/1	67/95
≥17	12/19	4/5	9/11	7/7	2/0	1/2	35/44
Total	52/48	14/19	39/74	20/31	10/10	5/13	140/195