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Table 4 Sensitivity analyses by treatment group

From: Cost-utility of an 8-month aquatic training for women with fibromyalgia: a randomized controlled trial

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
  1. QALY, quality adjusted life year.
  2. 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.