Table 2. Disease criteria and standardized part-worth utility values (β) for disease criteria levels by country.

Disease criteria1 and corresponding levels	Canada		US		t 4
	MUV 2	SD 3	MUV 2	SD 3
Duration of illness in humans
No illness observed or only a few days of illness	−47.58	22.40	−46.58	31.05	0.72∧
Short-term illness (weeks)	−26.00	23.78	−22.08	16.16	3.78*** ∧
Medium-term illness (months)	6.26	21.34	3.24	23.55	2.64** ∧
Chronic illness (years) or illness with permanent deficits	67.32	30.94	65.42	30.09	1.23
Transmission potential from animals to humans
No transmission from animals to humans	−38.81	18.86	−41.89	17.39	3.33** ∧
Low transmission from animals to humans	−28.33	18.40	−33.07	17.43	5.19***
Moderate transmission from animals to humans	5.23	17.15	13.03	16.83	9.00***
High	61.91	21.12	61.93	21.09	0.02
Disease trend in Canada/US in the last five years in animals
Decline over the last five years	−47.50	21.98	−48.38	21.66	0.80
Stable over the last five years	−24.50	18.50	−26.24	19.01	1.82
Increase over the last five years	25.03	18.23	28.13	17.74	3.38**
New emerging disease, rapid increase over the last five years	46.97	22.54	46.49	24.71	0.40∧
Economic burden in humans
No cost to the health care system and individuals	−35.66	26.38	−34.54	24.26	0.86∧
Low cost ($100 per sick individual)	−14.78	22.27	−22.16	18.03	7.14*** ∧
Moderate cost ($1,000 per sick individual)	6.50	16.63	8.61	16.44	2.50*
High cost ($10,000 per sick individual)	43.94	36.21	48.10	31.32	2.41* ∧
Transmission potential from humans to animals
No transmission from humans to animals	−26.88	17.37	−27.19	21.58	0.31∧
Low transmission from humans to animals	−25.98	18.96	−27.03	19.44	1.07
Moderate transmission from humans to animals	6.74	15.47	13.44	15.48	8.49***
High transmission from humans to animals	46.13	26.65	40.79	22.95	4.21*** ∧
Duration of illness in animals
No illness observed or only a few days of illness	−28.32	19.05	−33.47	18.99	5.31***
Short-term illness (weeks)	−9.97	20.26	−10.85	17.58	0.91∧
Medium-term illness (months)	1.21	18.71	6.68	17.37	5.93*** ∧
Chronic illness (years) or illness with permanent deficits	37.08	24.28	37.63	22.53	0.47∧
Transmission potential between animals
No transmission between animals	−27.27	21.02	−23.24	18.21	4.01*** ∧
Low transmission between animals	−13.53	15.78	−18.35	13.60	6.42*** ∧
Moderate transmission between animals	4.76	15.33	3.52	18.29	1.45∧
High transmission between animals	36.03	18.62	38.08	18.44	2.17*

¹Presented in order of importance to Canadian participants.

²Mean part-worth utility values (β) across respondents.

³Standard deviation of mean part-worth utility values (β) across respondents.

⁴ t-statistic; d.f. = 1,537.

^* p<0.05,

^** p<0.01,

^*** p<0.001.

^∧Adjusted for unequal variance using the Welch t-test; Satterthwaite’s d.f. = 1,282.61 to 1531.22.