Table 4

Sensitivity analyses by treatment group

Manipulation of variables

Incremental cost versus usual care per person (€)

Cost utility ratioa (€/QALY)


Health system analysis:

Number of participants per pool session:

30% lower (10 patients/group)

773

5,900

30% higher (20 patients/group)

389

2,969

Salary of personnel:

30% lower (monitor and nurse)

479

3,656

30% higher (monitor and nurse)

554

4,229

No additional salary of nurse

465

3,550

Best case scenario of salary, participation and effectivenessb

348

1,200

Worst case scenario of salary, participation and effectivenessv

830

75,455

Societal analysis:

Number of participants per pool session:

30% lower (10 patients/group)

1,288

9,832

30% higher (20 patients/group)

904

6,901

Salary of personnel:

30% lower (monitor and nurse)

994

7,588

30% higher (monitor and nurse)

1,069

8,160

No additional salary of nurse

980

7,481

Distance to facilities per session:

Near (without bus ticket and 1.5 h spent)

831

6,344

Far (4 bus ticket and 2.5 h spent)

1,442

11,008

Best case scenario of salary, participation, effectiveness and nearb

662

2,283

Worst case scenario of salary, participation, effectiveness and farc

1,755

159,545


QALY, quality adjusted life year.

aFrom the Spanish Health System, the cost-utility ratio threshold was set at € 23,153/QALY for 8 months in 2005; bpool rental + participation 20 persons per group + QALY differential at higher limit of 95% confidence interval; csalary 30% higher (monitor and nurse) + participation 10 persons per group + QALY differential at lower limit of 95% confidence interval.

Gusi and Tomas-Carus Arthritis Research & Therapy 2008 10:R24   doi:10.1186/ar2377

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