Table 3.

Correlation between GPs' characteristics and volume of antibiotic prescriptions per 1,000 patients for acute respiratory tract episodes*

Variables in model	Standardised beta coefficient
Acute respiratory tract episodes/1,000 patients/year	.67 (.57–.78)
Proportion of acute respiratory tract episodes labelled as infection	.24 (.13–.34)
GP's endorsement of the need of antibiotics in case of white spots in the throat	.11 (.01–.22)
Gender (male)	.11 (.00–.21)
Variance explained by the model (R2)	58%

*multiple linear regression analysis; standardised beta coefficient; 95%CI; n = 163 GPs