Table 2: Cost assumptions, willingness-to-pay value, transition probabilities in decision analysis of screening for gallstone disease.


Parameter Value

Annual direct cost (NT dollars)
   Screening cost 1 1,382
   Regular clinics fee 2 509
   Laparoscopic cholecystectomy 11,710
   Hospitalizations and others 26,825
   Total 40,426
Annual indirect cost (NT dollars)
   Gross Domestic Product, GDP 635,670
Willingness-to-pay value(NT dollars) [ 4 ]
   No gallstone disease 248.4 ± 178.9 (95%CI: 216.4-280.4)
   Single stone 335.3 ± 208.19 (95%CI: 298.1-372.5)
   Multiple stones 382.2 ± 221.89 (95%CI: 342.5-421.9)
   Cholecystectomy 470.5 ± 192.89 (95%CI: 436.0-505.0)
   Total 403.9 ± 238.09 (95%CI: 361.3-446.5)
Annual transition probability (%) [ 10 ]
   No gallstone diseaseSingle stone 5.05
   Single stoneMultiple stones 10.00
   Multiple stonesCholecystectomy 13.76

1Screening cost includes clinician's fee, ultrasound examination, SMA-12 test, and manpower cost. 2 Regular clinics fee includes clinician's fee and pharmacist's fee.