Table III.

Baseline predictors of using multiple pharmacies to fill prescriptions during calendar year 2005 in a study assessing prescription-filling behavior among patients enrolled in the Pharmaceutical Assistance Contract for the Elderly (PACE) pharmacy benefit program and those whose primary pharmacy was among the top 5 pharmacies in Pennsylvania, using a complete information model.

	All PACE patients (N = 182,116).		Patients whose primary pharmacy was among the top 5 pharmacies in Pennsylvania (N =75,413).
	Univariate	Multivariate	Univariate	Multivariate
		C statistic = 0.597		C statistic = 0.599
		Pseudo R2 = 0.0304		Pseudo R2 = 0.0323
	Odds ratio (95% CI)
Baseline covariates assessed in 2004
Age, y, as of January 1, 2005
65–74	Reference	Reference	Reference	Reference
75–84	0.96 (0.94–0.99)	0.96 (0.94–0.99)	0.92 (0.88–0.96)	0.93 (0.89–0.97)
≥85	1.05 (1.02–1.09)	1.07 (1.04–1.11)	0.90 (0.86–0.95)	0.93 (0.88–0.98)
Female gender	1.06 (1.03–1.09)	1.00 (1.00–1.00)	1.05 (1.00–1.09)	1.00 (1.00–1.00)
White race	0.64 (0.61–0.66)	1.00 (1.00–1.00)	0.64 (0.61–0.67)	1.00 (1.00–1.00)
Residence in an urban zip code	1.27 (1.24–1.30)	1.00 (1.00–1.00)	1.34 (1.30–1.39)	1.00 (1.00–1.00)
Number of unique medications in 2004
5 or less	Reference	Reference	Reference	Reference
6–9 Medications	1.29 (1.25–1.33)	1.38 (1.34–1.43)	1.27 (1.21–1.33)	1.37 (1.30–1.45)
10–14 Medications	1.64 (1.59–1.69)	1.83 (1.75–1.90)	1.60 (1.52–1.68)	1.81 (1.70–1.93)
≥15 Medications	2.35 (2.27–2.44)	2.66 (2.53–2.80)	2.38 (2.25–2.52)	2.78 (2.57–3.01)
Number of prescriptions filled in 2004
<25 Prescriptions	Reference	Reference	Reference	Reference
25–49 Prescriptions	1.07 (1.04–1.11)	0.87 (0.84–0.90)	1.06 (1.01–1.12)	0.86 (0.82–0.91)
49–74 Prescriptions	1.26 (1.22–1.31)	0.82 (0.78–0.86)	1.23 (1.16–1.30)	0.81 (0.76–0.87)
≥75 Prescriptions	1.52 (1.47–1.57)	0.77 (0.74–0.81)	1.45 (1.37–1.53)	0.74 (0.69–0.80)
Charlson comorbidity index score* in 2004
0	Reference	Reference	Reference	Reference
1–3	1.08 (1.06–1.11)	1.07 (1.04–1.11)	1.04 (1.00–1.08)	1.05 (1.00–1.11)
≥4	1.45 (1.41–1.50)	1.20 (1.14–1.27)	1.43 (1.35–1.51)	1.18 (1.08–1.29)
Diagnosis of cardiovascular disease in 2004	1.14 (1.12–1.17)	1.00 (1.00–1.00)	1.13 (1.09–1.17)	1.00 (1.00–1.00)
Diagnosis of diabetes in 2004	1.12 (1.09–1.15)	1.00 (1.00–1.00)	1.13 (1.09–1.18)	1.00 (1.00–1.00)
Diagnosis of psychiatric disease in 2004	1.34 (1.30–1.38)	1.00 (1.00–1.00)	1.26 (1.21–1.33)	1.00 (1.00–1.00)
Diagnosis of cancer (excluding nonmelanoma skin cancer) in 2004	1.11 (1.07–1.15)	1.00 (1.00–1.00)	1.12 (1.06–1.19)	1.00 (1.00–1.00)

^*The index can be used to predict 1-year mortality.