Table III.
Possible significant predictors of the total willingness to pay for vitiligo
| Variable | Total WTPa | |
|---|---|---|
| aORs (95% CI) | p-value | |
| DLQI | 1.008 (0.965–1.053) | 0.731 |
| Education | ||
| Primary school or below | 1 [reference] | NA |
| Middle-school | 2.694 (0.732–9.924) | 0.136 |
| High-school | 2.477 (0.668–9.189) | 0.175 |
| Technical college | 3.452 (0.946–12.579) | 0.061 |
| Bachelor’s degree or above | 4.768 (1.303–17.444) | 0.018 |
| Annual household income (CNY) | ||
| < 80,000 | 1 [reference] | NA |
| 80,000–160,000 | 1.685 (0.974–2.912) | 0.062 |
| 160,000–240,000 | 2.656 (1.344–5.249) | 0.005 |
| 240,000–320,000 | 4.745 (1.477–15.226) | 0.009 |
| > 320,000 | 6.246 (2.421–16.119) | 0.000 |
| Disease duration | ||
| < 6 weeks | 1 [reference] | NA |
| 6 weeks–0.5 year | 2.751 (0.973–7.776) | 0.056 |
| 0.5–1 year | 5.629 (1.990–15.927) | 0.001 |
| 1–3 years | 5.966 (2.079–17.116) | 0.001 |
| 3–5 years | 5.124 (1.502–17.462) | 0.009 |
| > 5 years | 2.416 (0.803–7.272) | 0.117 |
| Four limbs | ||
| Absent | 1 [reference] | NA |
| Present | 2.010 (1.076–3.751) | 0.029 |
| Hands and feet | ||
| Absent | 1 [reference] | NA |
| Present | 1.175 (0.691–1.996) | 0.551 |
| Hair/eyebrows/eyelashes | ||
| Absent | 1 [reference] | NA |
| Present | 2.186 (1.200–3.983) | 0.011 |
| Skin transplantation | ||
| Absent | 1 [reference] | NA |
| Present | 5.894 (2.034–17.064) | 0.001 |
a
Ordinal logistic regression models were constructed with the total WTP for vitiligo (< 3,000 CNY, < 6,000 CNY, < 10,000 CNY, < 30,000 CNY or > 30,000 CNY) as the ordinal dependent (outcome) variable. The model included the potential confounding variables. The independent (explanatory) variable was DLQI, education, annual household income, disease duration, the site of lesions, and the treatment modality received. There were no significant interactions in the multivariate models.
DLQI: Dermatology Life Quality Index; aOR: adjusted odds ratio; NA: not applicable; WTP: Willingness to Pay.