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Table 5 Prescription costs per patient—results of bivariate robust regression analyses and Spearman’s—rho coefficients in neurology and psychiatry (n = 3080)

From: Factors associated with prescribing costs: analysis of a nationwide administrative database

Independent variables

R2

lmrob

Spearman

Number of patients

.14

.24

Average age of patients

.15

.39

Median age of patients

.15

.41

Proportion of pensioners

.20

.45

Proportion of female patients

.02

− .14

Morbidity index

.06

.32

Proportion of prescriptions issued (PPI)

.00

− .07

Proportion of DDD issued (PDDD)

.01

− .06

Proportion of polypharmacy patients

.15

.40

Proportion of polypharmacy patients ≥ 2Q

.20

.46