Table 9:

Input Parameters: Probabilities and Risks

Model Parameter	Mean	Rangea	Reference
Initial distribution of people in compression stockings arm
High pressure (25–35 mm Hg)	0.3	0.1–0.5	Expert opinion
Low pressure (18–24 mm Hg)	0.7	0.4–0.9	Expert opinion
Support (14–17 mm Hg)	0	0.1–0.3	Expert opinion
Monthly probabilities and rates
Probability of nonadherence:
High pressure (25–35 mm Hg)	0.009	0.006–0.012	Nelson et al, 200627
Low pressure (18–24 mm Hg)	0.005	0.003–0.007	Nelson et al, 200627
Support (14–17 mm Hg)	0.0005b	0.0002–0.0008	Nelson et al, 200627
Probability of ulcer recurrence, compression stockings:
High pressure (25–35 mm Hg)	0.006	0.004–0.008	Nelson et al, 200627
Low pressure (18–24 mm Hg)	0.008	0.006–0.010	Nelson et al, 200627
Support (14–17 mm Hg)	0.010	0.008–0.012	Assumption
Weighted average	0.0077	0.0070–0.0085	Calculation based on above
Risk of ulcer recurrence:
Compression stockings vs. no compression stockings	0.43	0.27–0.69	Vandongen & Stacey, 200028
Probability of ulcer healing with compression bandages	0.163	0.147–0.179	Pham et al, 201240
Probability of infection	0.05	0.1–0.01	Carter et al, 201449

^aRanges were used in one-way sensitivity analyses.

^bIn the reference case analysis, we assume no one starts on support; therefore, this value is used only in the sensitivity analyses.