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Table 7 Effect of respondent characteristics and initial bids on willingness-to-pay amounts

From: Values for preventing influenza-related morbidity and vaccine adverse events in children

Variable Type of variable Impact on WTP 95 % CI P value
Independent variables:     
   WTP amounts1     
Dependent variables:     
Baseline2 Constant 0.9368 (0.3763, 2.3324) 0.8864
Age3     
   18–34 Binary 1.1458 (0.5055, 2.5974) 0.7401
   35–49 Binary 1.6824 (0.8564, 3.3049) 0.1265
   50–64 Binary 1.3450 (0.6492, 2.7865) 0.4177
Female Binary 0.7866 (0.5222, 1.1851) 0.2444
Education: Some college or less Binary 0.9690 (0.6066, 1.5479) 0.8934
Not married Binary 0.7606 (0.4610, 1.2551) 0.2773
Health (Worse than average) Binary 1.1183 (0.7166, 1.7451) 0.6166
No children under 18 in household Binary 1.1254 (0.6360, 1.9911) 0.6797
Version (initial bid)4     
   1 ($100) 4 binary variables, one for each initial bid 1.3809 (0.7945, 2.4001) 0.2460
   2 ($200)   1.0257 (0.5832, 1.8040) 0.9286
   3 ($25)   0.7572 (0.4293, 1.3355) 0.3293
Income (less than 3X poverty level) Binary 0.9811 (0.4957, 1.9416) 0.9554
Number of disease experienced: None Binary (0 v. 1 or more) 0.6862 (0.4216, 1.1169) 0.1254
  1. 1 Independent variables included for each respondent were uncomplicated influenza in a 1-year-old, uncomplicated influenza in a 14 year-old, and anaphylaxis or Guillain-Barré syndrome. R-squared = 0.1725.
  2. 2 Baseline refers to a person over 65 years of age, male, college graduate, married, good health, with income three times or greater than poverty level, children under 18 living in the household, familiar with at least one of the conditions in the survey, and responding to survey version 4 (initial bid of $50).
  3. 3 Compared to 65 and over.
  4. 4 Compared to version 4 (initial bid of $50).