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Table 5 OLS regression analysis to examine the factors affecting WTP per QALY values

From: Value of willingness to pay for a QALY gained in Iran; a modified chained-approach

 

Dependent variable: Ln(willingness to pay)

Variables

Aggregate model

Trimmed modela

Green health state

Yellow health state

Total

Green health state

Yellow health state

Total

Ln(life expectancy)

-0.103 (0.18)

-0.296* (0.18)

-0.121 (0.13)

0.017 (0.14)

-0.251 (0.14)

-0.122 (0.09)

Ln(BMI)

0.519* (0.27)

0.466* (0.26)

0.115 (0.19)

0.194 (0.20)

-0.425** (0.16)

-0.088 (0.11)

Ln(education years)

0.543*** (0.12)

0.194* (0.11)

0.373*** (0.08)

0.247*** (0.07)

0.158** (0.07)

0.229*** (0.06)

Ln(per capita monthly household expenditure)

0.249*** (0.06)

0.342*** (0.06)

0.288*** (0.04)

0.102** (0.04)

0.116*** (0.04)

0.112*** (0.03)

Female = 1

-0.082 (0.10)

0.085 (0.08)

0.077 (0.06)

-0.020 (0.06)

0.008 (0.06)

0.014 (0.05)

Employed = 1

0.299*** (0.09)

0.048 (0.09)

0.151** (0.06)

-0.126* (0.05)

-0.026 (0.06)

-0.080 (0.05)

Married = 1

-0.103 (0.09)

-0.221** (0.09)

-0.184*** (0.06)

-0.003 (0.05)

-0.045** (0.05)

-0.020 (0.04)

Urban = 1

0.162 (0.14)

0.185 (0.14)

0.169* (0.10)

0.109 (0.08)

0.249 (0.09)

0.178** (0.07)

Having basic insurance = 1

0.080 (0.13)

0.149 (0.13)

0.136 (0.09)

0.073 (0.07)

0.197 (0.09)

0.124* (0.07)

Head of household = 1

-0.374*** (0.12)

-0.114 (0.12)

-0.272*** (0.09)

-0.166* (0.09)

-0.085 (0.09)

0.131* (0.07)

Health utility

-0.265** (0.11)

-0.118** (0.12)

-0.213*** (0.08)

-0.234** (0.10)

-0.194** (0.11)

-0.221*** (0.09)

Constant

5.368 (1.24)

9.430 (1.19)

6.641 (0.84)

6.628 (0.98)

9.130 (0.96)

7.778 (0.56)

Observations

1525

1329

2854

1314

1182

2496

R-squared

0.17

0.16

0.15

0.21

0.20

0.17

Prob > F

< 0.001

< 0.001

< 0.001

<0.001

0.003

<0.001

  1. Robust standard deviation in parentheses
  2. *** p<0.01, ** p<0.05, * p<0.1
  3. a Outliers are trimmed according to the definition of a boxplot (exceeding Q3 + 1.5 * (Q3-Q1))