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Table 3 Aggregate and trimmed values of WTP per QALY estimates* in $US by the health state scenarios

From: Value of willingness to pay for a QALY gained in Iran; a modified chained-approach

Values

Green health state

(21121)

N= 1525 (53.43%)

Yellow health state

(22222)

N= 1329 (46.57%)

Total

N= 2854 (100.00%)

Model 1. Aggregate WTP per a QALY

 Mean (SD)

6737.90 (2282.57)

7402.12 (2347.78)

7047.20 (2329.05)

 95% CI

[6573.02 - 6902.78]

[7221.97 - 7582.27]

[6925.02 - 7169.39]

 Median (IQR)

6694.90 (2666.67)

7287.12 (4444.44)

6737.90 (3666.67)

 Mean/GDP per capita

1.23

1.35

1.28

 Median/GDP per capita

1.22

1.33

1.23

 Health utility (SD)

0.545 (0.35)

0.461 (0.33)

0.506 (0.35)

 Non-tradersa [N(%)]

178 (11.67)

178 (13.39)

356 (12.47)

 Protestersb [N(%)]

200 (13.11)

135 (10.15)

335 (11.74)

 Outliersc [N(%)]

211 (13.84)

147 (11.06)

358 (12.54)

Model 2. Aggregate WTP per a QALY without protesters

 Mean (SD)

7754.52 (2834.44)

8238.31 (2564.76)

7984.59 (2638.85)

 95% CI

[7466.22 -7928.72]

[8095.34 – 8448.40]

[7846.16 – 8123.03]

 Median (IQR)

7144.83 (2512.84)

7788.24 (3856.73)

7408.43 (3134.23)

 Health utility (SD)

0.561 (0.33)

0.473 (0.32)

0.517 (0.33)

Model 3. Aggregate WTP per a QALY without outliers

 Mean (SD)

6484.55 (1938.00)

7122.03 (1978.46)

6799.44 (1988.99)

 95% CI

[6334.95 - 6634.16]

[6959.34 - 7284.72]

[6688.32 - 6910.56]

 Median (IQR)

6357.90 (1626.79)

7122.03 (2122.23)

6737.90 (2266.667)

 Health utility (SD)

0.527 (0.34)

0.446 (0.32)

0.489 (0.34)

Model 4. Aggregate WTP per a QALY without protesters and outliers

 Mean (SD)

7648.74 (2185.94)

8121.97 (2163.32)

7925.86 (2318.50)

 95% CI

[7326.29 – 7824.53]

[7936.44 – 8307.50]

[7796.34 – 8055.35]

 Median (IQR)

6938.66 (1506.74)

8009.53 (2017.45)

7510.87 (1738.22)

 Health utility (SD)

0.532 (0.33)

0.483 (0.33)

0.509 (0.33)

  1. WTP Willingness to pay, QALY Quality Adjusted Life Years, SD Standard deviation, CI Confidence Interval, IQR Interquartile range, GDP Gross Domestic Production
  2. a Respondents who traded off no time at all in the TTO technique
  3. b Non-payers
  4. c According to the definition of a boxplot (exceeding Q3 + 1.5 * (Q3-Q1) but lower than 99 percentile)
  5. * in the estimated WTP per QALY ‘non-traders’ and ‘outliers’ are omitted and Iranian GDP per capita was considered as 5494.06 $US in 2017