TABLE 1.

Orthogonal array of attribute level choice-sets

	CHOICE A							CHOICE B
Question	Sleep onset latency (minutes)	No. of awakenings	Wake time after sleep on-set (minutes)	Total sleep time (hours)	Hangover	Duration of use approved	Cost	Sleep onset latency (minutes)	No. of awakenings	Wake time after sleep on-set (minutes)	Total sleep time (hours)	Hangover	Duration of use approved	Cost
1	10	1	15	6	None	3–4 weeks	$20	20	2	45	7	Mild	6 months	$35
2	20	2	45	7	Mild	6 months	$20	30	3	60	8	Moderate	Indefinite	$35
3	30	3	60	8	Moderate	Indefinite	$20	10	1	15	6	None	3–4 weeks	$35
4	10	1	45	8	Mild	Indefinite	$20	20	2	60	6	Moderate	3–4 weeks	$35
5	20	2	60	6	Moderate	3–4 weeks	$20	30	3	15	7	None	6 months	$35
6	30	3	15	7	None	6 months	$20	10	1	45	8	Mild	Indefinite	$35
7	10	2	15	8	Moderate	6 months	$35	20	3	45	6	None	Indefinite	$50
8	20	3	45	6	None	Indefinite	$35	30	1	60	7	Mild	3–4 weeks	$50
9	30	1	60	7	Mild	3–4 weeks	$35	10	2	15	8	Moderate	6 months	$50
10	10	3	60	6	Mild	6 months	$35	20	1	15	7	Moderate	Indefinite	$50
11	20	1	15	7	Moderate	Indefinite	$35	30	2	45	8	None	3–4 weeks	$50
12	30	2	45	8	None	3–4 weeks	$35	10	3	60	6	Mild	6 months	$50
13	10	2	60	7	None	Indefinite	$50	20	3	15	8	Mild	3–4 weeks	$20
14	20	3	15	8	Mild	3–4 weeks	$50	30	1	45	6	Moderate	6 months	$20
15	30	1	45	6	Moderate	6 months	$50	10	2	60	7	None	Indefinite	$20
16	10	3	45	7	Moderate	3–4 weeks	$50	20	1	60	8	None	6 months	$20
17	20	1	60	8	None	6 months	$50	30	2	15	6	Mild	Indefinite	$20
18	30	2	15	6	Mild	Indefinite	$50	10	3	45	7	Moderate	3–4 weeks	$20