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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Pharmacoeconomics. 2019 Apr;37(4):563–572. doi: 10.1007/s40273-019-00785-6

Table 2.

Two-part regression model of willingness to pay

Part 1: Probability willing to
pay >$0a
Part 2: Amount willing to pay
given willing to pay >$0b
Combined Marginal effect
(95% Confidence Interval)
n=200
Coefficient
(95% Confidence Interval)
n=128
Coefficient
(95% Confidence Interval)
Intercept −1.73 (−6.53, 3.07) 4.20 (2.68, 5.72)***
Caregiver characteristics
Age −0.01 (−0.06, 0.03) 0.01 (−0.01, 0.03) $0.16 (−$0.79, $1.11)
Education (ref = less than college)
 At least a college education 1.39 (0.65, 2.14)*** 0.61 (0.34, 0.89)*** $38.62 ($20.90, $56.34)***
Race (ref = White)
 African American −1.51 (−2.28, −0.73)*** −0.05 (−0.39, 0.29) −$18.04 (−$31.37, −$4.70)*
 Other −1.61 (−3.09, −0.13)** 0.06 (−0.95, 1.06) −$16.60 (−$48.66, $15.46)
Relation to person with dementia (ref = spouse)
 Child 0.72 (−0.65, 2.09) −0.10 (−0.85, 0.66) $3.16 (−$22.91, $29.24)
 Other 0.44 (−1.39, 2.26) 1.11 (−0.27, 2.5) $74.09 (−$60.69, $208.87)
Financial difficulty (ref = no difficulty)
 Has financial difficulty 0.08 (−0.61, 0.77) 0.16 (−0.13, 0.44) $6.54 (−$6.18, $19.26)
Employment (ref = not employed)
 Currently employed −0.26 (−1.11, 0.58) −0.43 (−0.74, −0.11)* −$16.47 (−$29.49, −$3.44)*
Hours providing care in a day −0.01 (−0.08, 0.06) 0.05 (0.02, 0.08)** $1.64 ($0.23, $3.04)*
Person with dementia characteristics
Age 0.04 (−0.01, 0.1) −0.03 (−0.05, 0.00) −$0.48 (−$1.62, $0.67)
Female −0.70 (−1.71, 0.32) 0.23 (−0.20, 0.66) $1.62 (−$16.15, $19.40)
Living Situation (ref = lives with at least someone else)
 Lives alone −0.28 (−1.5, 0.93) 0.43 (−0.07, 0.94) $14.61 (−$16.81, $46.04)
Mini-Mental State Examination 0.00 (−0.06, 0.05) 0.01 (−0.01, 0.03) $0.30 (−$0.58, $1.17)
Number of behaviors 0.00 (−0.15, 0.15) 0.00 (−0.05, 0.05) $0.13 (−$2.21, $2.47)
Number of functional limitations −0.01 (−0.12, 0.09) 0.03 (−0.02, 0.07) $0.84 (−$1.21, $2.89)
*

p<0.05,

**

p<0.01,

***

p<0.001

a

Hosmer-Lemeshow goodness of fit p = 0.4877;

b

Scaled deviance = 88.16, p = 0.95