Table 1.

Participant demographics

		Total (%)	Stage 0	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5	Stage 7
Total		3247 (100%)	370 (12%)	923 (28%)	293 (9%)	602 (19%)	388 (12%)	89 (3%)	582 (18%)
Age
	Missing	40 (1)	2	8	3	9	4	1	13
	<30	109 (3)	23	31	4	11	7	1	32
	30–40	220 (7)	45	74	18	27	15	3	38
	40–50	586 (18)	81	151	50	105	78	20	101
	50–60	937 (29)	108	232	86	216	130	19	146
	60–70	844 (26)	81	241	72	164	110	27	149
	70–80	381 (12)	22	137	43	62	36	11	70
	>80	130 (4)	8	49	17	8	8	7	33
Sex
	Male	1836 (57)	160	487	150	431	246	50	312
	Female	1411 (42)	210	436	143	171	142	39	270
Race
	Asian	33 (1)	6	11	0	3	5	0	8
	Black	261 (8)	40	67	30	34	28	8	54
	Hispanic	45 (1)	5	18	2	6	6	2	6
	Native American	6 (0)		3	0	0	0	1	2
	White	2822 (87)	312	813	256	544	336	75	486
	Other	9 (0)	3	2	0	2	1	0	1
	Missing	71 (2)	4	9	5	13	12	3	25
Ethnicity
	Hispanic	45 (1)	5	18	2	6	6	2	6
	Not Hispanic	3115 (96)	361	890	284	583	372	84	541
	Unknown	87 (3)	4	15	7	13	10	3	35