Table 3.

Hospital efficiencies for leukodystrophy patients (see graphical representation in Figure 1).

i. Efficiency of admissions (costs efficiency). A value closer to 1 indicates that the percent of costs was equal, or nearly equal, to the percent of admissions. Calculated by dividing percent of admissions/percent of costs. ii. Volume of admissions. This calculates the relative proportion of leukodystrophy patient admissions, compared to total patient admissions. iii. Admission frequency, controls for whether certain institutions were admitting their patients with similar frequencies, calculated by percent of patients/percent of admissions. Definitions: Percent of admissions: percent of patients at each hospital that are leukodystrophy patients. Percent of costs: percent of costs at each hospital accounted for by leukodystrophy patients. Percent of patients: the percent of patients at each hospital that are leukodystrophy patients.

Category	Average/Hospital	Range	Standard deviation
i. Efficiency (cost)	0.59	0.20–0.96	0.14
ii. Volume	0.21	0.05–0.45	0.07
iii. %Pat/%Adm	0.36	0.19–0.50	0.07