Table 3a.

MRS Estimates (95% CI)^a for Each Categorical Survey Attribute versus Travel Time (in Minutes) for SP-Ordered Categorical and DCE Survey Responses from 4,757 Males, after Applying Alternative Regression Models^b

	Model 1: Ordered Logit/MNL		Model 2: MNL		Model 3: MNL with Random Effects		Model 4: Ordinal GLM/G-MNL
	SP-Ordered Categorical	DCEc	SP-Ordered Categorical	DCEc	SP-Ordered Categorical	DCE	SP-Ordered Categorical	DCE
Health report	2.79 [1.59, 4.00]	8.49 [7.13, 9.85]	2.74 [1.45, 4.04]	8.49 [7.13, 9.85]	2.67 [1.23, 4.10]	8.49 [7.47, 9.50]	2.42 [1.05, 3.79]	7.97 [7.00, 8.93]
Opening time: 9 am–5 pm*	0.78 [−0.95, 2.51]	1.98 [0.05, 3.91]	1.12 [−0.66, 2.91]	1.98 [0.05, 3.91]	2.34 [0.46, 4.21]	1.98 [0.46, 3.50]	0.77 [0.32, 1.22]	0.41 [−0.82, 1.94]
Opening time: 9 am–8 pm*	11.04 [9.15, 12.92]	13.83 [11.59, 16.07]	12.08 [10.15, 14.02]	13.83 [11.59, 16.07]	13.57 [11.33, 15.80]	13.83 [12.05, 15.61]	11.07 [9.42, 12.73]	7.65 [6.40, 9.46]
Opening time: 2 pm–8 pm*	5.50 [3.73, 7.28]	3.44 [1.31, 5.57]	5.79 [4.08, 7.51]	3.44 [1.31, 5.57]	6.64 [4.80, 8.48]	3.44 [2.00, 4.88]	5.58 [4.04, 7.13]	−0.68 [−2.17, 1.15]
Availability: Every weekday: Monday–Friday**	−6.57 [−8.75, −4.40]	−2.46 [−4.04, −0.88]	−7.48 [−9.60, −5.36]	−2.46 [−4.04, −0.88]	−7.99 [−10.45, −5.54]	−2.46 [−3.69, −1.24]	−4.63 [−6.04, −3.21]	−0.38 [−1.42, 0.58]
Availability: 1 d every 2 mo: Monday–Friday**	−16.06 [−18.15, −13.97]	−18.31 [−20.57, −16.05]	−17.13 [−19.24, −15.02]	−18.31 [−20.57, −16.05]	−16.52 [−18.75, −14.29]	−18.31 [−19.79, −16.84]	−14.25 [−16.32, −12.18]	−15.63 [−17.24, −14.55]
Availability: 1 d every 2 mo: Saturday or Sunday**	−28.01 [−30.39, −25.63]	−33.65 [−36.55, −30.75]	−28.92 [−31.22, −26.62]	−33.65 [−36.55, −30.75]	−30.73 [−33.26, −28.19]	−33.65 [−35.46, −31.84]	−29.14 [−30.74, −27.55]	−32.16 [−34.17, −30.25]
Max donations: 5***	13.69 [11.89, 15.49]	11.81 [9.99, 13.63]	12.78 [10.92, 14.64]	11.81 [9.99, 13.63]	7.44 [5.48, 9.39]	11.81 [10.39, 13.23]	18.17 [16.36, 19.99]	10.48 [9.16, 12.03]
Max donations: 6***	23.20 [21.31, 25.10]	17.72 [15.88, 19.56]	21.83 [19.90, 23.75]	17.72 [15.88, 19.56]	7.54 [5.64, 9.43]	17.72 [16.44, 19.00]	36.74 [33.87, 39.61]	16.20 [14.74, 17.70]

CI, confidence interval; DCE, discrete choice experiment; GLM, generalized linear model; G-MNL, generalized multinomial logit; MNL, multinomial logit; MRS, marginal rates of substitution; NHSBT, NHS Blood and Transfusion; SP, stated preference.

^aConfidence interval calculated with nonparametric bootstrap.

^bReference category: *9 am–12 pm and 2 pm–5 pm; **every day: Monday to Sunday; ***4 donations per year.

^cModels 1 and 2 are the same for the DCE model.