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Table 2 Prescription costs per patient—results of bivariate robust regression analyses and Spearman’s—rho coefficients in GPs/family physicians (n = 30,325)

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

Independent variables

R2

lmrob

Spearman

Practice size (number of patients)

.04

.21

Average age of patients

.30

.51

Median age of patients

.31

.53

Proportion of pensioners

.32

.53

Proportion of female patients

.03

− .15

Morbidity index

.03

.23

Proportion of prescriptions issued (PPI)

.38

.49

Proportion of DDD issued (PDDD)

.36

.47

Proportion polypharmacy patients

.34

.50

Proportion polypharmacy patients ≥ 2Q

.49

.62