Table 4.
Tobit model analyses of EQ-5D-5L utility scores and EQ-VAS scores
| Variable | EQ-VAS score | Utility score | ||||||
|---|---|---|---|---|---|---|---|---|
| Model 1a n = 287 |
Model 2b n = 306 |
Model 1a n = 288 |
Model 2b n = 296 |
|||||
| β coeff | 95% CI | β coeff | 95% CI | β coeff | 95% CI | β coeff | 95% CI | |
| Treatment status | ||||||||
| Patientref | ||||||||
| Survivor | 9.3* | 4.5–14.1 | 9.0* | 4.4–13.6 | 0.06* | 0.01–0.11 | 0.07* | 0.02–0.11 |
| Age group, years | ||||||||
| < 40ref | ||||||||
| 40–49 | − 0.1 | − 5.1–4.9 | − 0.6 | − 5.3–4.1 | − 0.05 | − 0.09–0.00 | − 0.04 | − 0.08–0.00 |
| 50–59 | − 4.5 | − 10.7–1.6 | − 4.8 | − 10.6–0.9 | − 0.04 | − 0.12–0.03 | − 0.04 | − 0.09–0.02 |
| 60 + | − 9.4* | − 16.9–− 1.8 | − 9.2* | − 16.2–− 2.2 | − 0.11* | − 0.18–− 0.03 | − 0.10* | − 0.17–− 0.03 |
| Residence | ||||||||
| Ruralref | ||||||||
| Urban | 1.1 | − 4.2–6.5 | 0.03 | − 0.04–0.10 | ||||
| Education level | ||||||||
| Completed up to secondary schoolref | ||||||||
| Completed high school | 4.7 | − 3.2–12.6 | 5.8 | − 1.1–12.8 | 0.05 | − 0.03–0.13 | 0.06 | − 0.02–0.15 |
| Completed graduate | 5.8 | − 1.1–12.7 | 7.8* | 2.2–13.4 | 0.06 | − 0.01–0.13 | 0.08* | 0.01–0.15 |
| Completed postgraduate | 7.4 | − 3.8–18.6 | 9.6* | 0.5–18.7 | 0.10* | 0.00–0.19 | 0.12* | 0.03–0.21 |
| Marital status | ||||||||
| Single/separated/divorce/widowref | ||||||||
| Married | − 1.1 | − 6.5–4.3 | 0.01 | − 0.01–0.09 | ||||
| Household monthly income | ||||||||
| ≤ 3000000 VND (~ £100)ref | ||||||||
| 3000001–6000000 VND (~ £100–200) | 2.0 | − 6.5–10.4 | 0.04 | − 0.06–0.14 | 0.04 | − 0.05–0.14 | ||
| 6000001–9000000 VND (~ £200–300) | 3.9 | − 5.0–12.7 | 0.07 | − 0.03–0.17 | 0.07 | − 0.02–0.17 | ||
| 9000001–12000000 VND (~ £300–400) | 2.4 | − 6.2–11.0 | 0.09 | − 0.01–0.18 | 0.09* | 0.00–0.18 | ||
| > 12000000 VND (~ £400) | 3.0 | − 5.6–11.5 | 0.07 | − 0.02–0.16 | 0.08 | –0.01–0.17 | ||
| AIC | 2463 | 2605 | − 176.5 | − 191.6 | ||||
| BIC | 2518 | 2638 | − 121.5 | − 143.7 | ||||
Exchange rate in October 2020: £1 ~ 30,000 VND
β coeff beta coefficients of the Tobit model, ref reference group, AIC akaike information criteria, BIC bayesian information criteria, VND vietnamese dong
*p < 0.05 versus reference group
aModel 1 with all exploratory variables
bModel 2 included only variables with significant coefficients (Backward elimination). Both model 1 and 2 included only complete cases (observations with missing data were excluded) lead to the total number of observations in each model (n) was different