Table 3

Description of indices, parameters & variables
Notation Description
Indices
d Diagnosis group
f Facility
p Zip code area
q Zip code area
Parameters
ad The slope of the (linear) volume-outcome relationship of diagnosis group d
bd The constant term of the (linear) volume-outcome relationship of diagnosis group d
EQ Euros per QALY
ET Travel expenses per time unit
M Big number [1,000,000]
maxtd The maximum acceptable travel time for diagnosis group d
minuf Minimum utilization per facility f
NPd The number of patients per diagnosis group d
<a onClick="popup('http://www.biomedcentral.com/1472-6963/13/220/mathml/M3','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1472-6963/13/220/mathml/M3">View MathML</a> The number of patients per diagnosis group d and zip code p
NVd The total number of visits per patient having diagnosis d
TTp,q The driving time from zip code p to zip code q
Ufd The amount of resources each patient within diagnosis group d makes use of facility f
Dependent variables
Qualityd Total quality achieved for diagnosis group d [euros]
Traveld Total travel costs made for diagnosis group d [euros]
NLd The number of locations treating diagnosis group d
Decision variables
Xp Whether a health care location is established in zip code p
Zq,d Whether diagnosis group d is treated at potential hospital location with zip code q
Yp,q,d Whether for diagnosis group d patients from zip code p are assigned to potential hospital location with zip code q

Ikkersheim et al.

Ikkersheim et al. BMC Health Services Research 2013 13:220   doi:10.1186/1472-6963-13-220

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