Table 2.

Characteristics of the variables in the three-level hierarchical generalized logistic model (HGLM).

VARIABLE	N	Mean	SD	Min.	Max.
Level 3-Hospital
Center of Excellence	52	0.15	0.36	0	1
Hospital months in PHIS	52	34.65	4.96	9	36
Level 2-Zip Code
Median household Income (U.S. $)	36274	44384.85	18528.02	6330	194591
Proportion non-White	36274	0.29	0.25	0	1
Proportion HPSA	36274	0.35	0.48	0	1
Distance to hospital (miles)	36274	262.92	425.96	0	5091
Urban/Rural Context
Urban core	REF	REF	REF	REF	REF
Large rural	36274	0.13	0.33	0	1
Small rural	36274	0.09	0.28	0	1
Isolated	36274	0.12	0.32	0	1
Other urban	36274	0.15	0.36	0	1
Level 1-Patient
Age at first admit in study period (years)	1070062	5.42	6.02	0	18
Male (v.ersus female)	1069782	0.53	0.5	0	1
Inpatient days (per time in PHIS)	1066747	0.02	0.08	0	12.23
Number of admits (per time in PHIS)	1066747	0.07	0.11	0.03	5
Patient Race/Ethnicity
White, non-Hispanic	REF	REF	REF	REF	REF
Hispanic	970094	0.22	0.42	0	1
Black, non-Hispanic	948134	0.18	0.39	0	1
Asian, non-Hispanic	948126	0.04	0.18	0	1
Other race, non-Hispanic	827568	0.08	0.27	0	1
Patient Payer Status
Private payer	REF	REF	REF	REF	REF
Government payer	1051169	0.55	0.5	0	1
Other payer	1051169	0.04	0.21	0	1
ICD-10 Code for leukodystrophy
[DEPENDENT VARIABLE]	1070062	0	0.02	0	1

Note: this table reports descriptive statistics for the cases included in the HGLM analyses; no missing data were permitted for analysis across the included variables.

Abbreviations: HPSA, Health Professional Shortage Area.