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Table 4 Estimated coefficients of the Two-Parts Model for WTP per dose of dengue vaccine

From: The acceptance and willingness to pay (WTP) for hypothetical dengue vaccine in Penang, Malaysia: a contingent valuation study

Independent variable Willingness to pay?a WTP amountb
Coefficient Standard error p-value Coefficient Standard error p-value
Age − 0.0152 0.0141 0.279 − 2.1193 0.9059 0.019*
Gender
 Male
 Female − 0.1589 0.2308 0.491 − 38.1953 12.0638 0.002*
Ethnicity
 Malay
 Chinese 0.3222 0.2767 0.244 16.7443 13.1574 0.203
 Indian − 0.3955 0.312 0.205 11.0081 20.0119 0.582
 Others − 0.1273 0.5203 0.807 18.5897 38.4334 0.629
Have children
 No
 Yes 0.6508 0.3418 0.057 13.8021 17.0662 0.419
Education level (ISCED 2011 level)
 0
 1 2.0927 0.8216 0.011* 83.3829 70.1123 0.234
 2 2.8677 0.7849 <0.001* 74.2732 66.4999 0.264
 3 3.2913 0. 8174 <0.001* 94.6604 67.7156 0.162
 > 4 3.0722 0.7662 <0.001* 113.2698 66.8408 0.090
Occupation
 Unemployed
 Pensioner 2.3724 1.1288 0.036* 69.0878 26.0633 0.008*
 Student 0.6855 0.4639 0.139 − 54.9633 19.8143 0.006*
 Government servant 0.3201 0.3961 0.419 − 19.2953 17.4188 0.268
 Private/Self-employed 1.2063 0.3959 0.002* 21.4933 16.0178 0.180
Monthly household income
 ≤ RM1000
 RM1001–RM2000 − 1.3307 0.399 0.001* − 51.5993 18.1789 0.005*
 RM2001–RM3000 − 0.4423 0.4109 0.282 − 4.9886 15.2938 0.744
 RM3001–RM4000 − 1.0823 0.4008 0.007* 4.8979 16.0833 0.761
 RM4001–RM5000 − 1.0505 0.4496 0.019* 11.7889 21.4033 0.582
 ≥ RM5001 0.0101 0.4635 0.983 35.1865 22.8796 0.124
Experience with dengue disease
 No
 Yes 0.1046 0.224 0.64 5.1199 11.5706 0.658
Dengue disease knowledge score − 0.0167 0.8782 0.849 3.1789 4.5639 0.486
Household dengue prevention practice score 0.0634 0.0358 0.076 4.9612 2.0577 0.016*
Vaccination attitude score 0.0364 0.0822 0.658 3.749 3.4303 0.274
Dengue vaccine acceptance
 No
 Yes 3.2343 1.002 0.001* − 38.0342 64.9667 0.558
Vaccine
 A
 B 0.6693 0.2309 0.004* 51.655 9.9542 < 0.001*
 B for children 1.3994 0.3663 < 0.001* 77.302 15.4756 < 0.001*
Constant − 5.8708 1.5646 < 0.001* 39.2072 87.9101 0.656
  1. * Significant at P < 0.05; Pseudo R2 = 0.1421
  2. aSelection equation using Logit
  3. bRegression
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