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Logistic regression model of willingness to pay additionally (yes/no) regressed against total monthly income of household (grouped as 0–4,999, 5,000–9,999, and ≥10,000 Baht) and education level of respondent (grouped as none, primary, and secondary and above)
| Parameter | Estimate | Error | Odd ratio | 95% CI |
|---|---|---|---|---|
| Intercept | −1.557 | 0.600 | ||
| Monthly income | 0.368 | 0.184 | 1.44 | 1.01–2.07 |
| Education level | 0.529 | 0.257 | 1.70 | 1.03–2.81 |
