Table 3.

Part-worth utilities, RI, and rankings of attributes in overall sample

Parameter	Attribute levels	Part-worth utility estimate (SE)1	P-value2	Overall part-worth utility value3	RI4 (%)	Rank
Dosing frequency	Once a day (365 times per year)	−0.461 (0.042)	<0.0001	0.92	41.6	1
	Once a week (52 times per year)	0.461 (0.042)	<0.0001
Type of delivery system	Multidose prefilled pen	−0.393 (0.042)	<0.0001	0.79	35.5	2
	Single-use prefilled pen	0.393 (0.042)	<0.0001
Frequency of nausea	20.4% experience nausea	−0.115 (0.022)	<0.0001	0.23	10.4	3
	18.0% experience nausea	0.115 (0.022)	<0.0001
Weight change	2.90 kg weight loss	−0.066 (0.022)	0.0023	0.13	5.9	4
	3.61 kg weight loss	0.066 (0.022)	0.0023
Blood sugar (HbA1c) change	67.9% at goal	−0.040 (0.015)	0.0095	0.08	3.6	5
	68.3% at goal	0.040 (0.015)	0.0095
Frequency of low blood sugar events (hypoglycemia)	Once every 2 years	−0.033 (0.021)	0.1283	0.07	3.0	6
	Once every 3 years	0.033 (0.021)	0.1283

Notes:

¹Part-worth utility values provide information on the extent to which participants prefer each level of an attribute and are scaled within each attribute to have a mean of 0. A positive part-worth utility value indicates that the attribute level is preferred, while negative values indicate a preference for other levels of the attribute.

²The P-values indicate whether the part-worth utility value differs significantly from 0.

³The overall utility values represent the range of utility values within each attribute.

⁴ $\text{RI for each attribute}=\frac{\text{Overall utility value for each attribute}}{\text{Total utility value}}$, where total utility value = sum of overall utility values across all attributes.

Abbreviations: HbA_1c, hemoglobin A_1c; RI, relative importance; SE, standard error.