Table 3

Associations between standardised antibiotic prescribing volume, practice characteristics, and practice population characteristics based on multiple regression.

VariableUnstandardised regression coefficient, B (95%CI)Standardised regression coefficient, β
Practice characteristics
Location
 North of England0.07 (0.06 to 0.08)0.17
 Midlands0.04 (0.03 to 0.05)0.09
Longer appointment duration–0.09 (–0.10 to –0.07)–0.11
GP sex: female–0.05 (–0.07 to –0.04)–0.08
GP country of qualification: UK–0.04 (–0.05 to –0.02)–0.08
GP age: <45 years–0.04 (–0.06 to –0.03)–0.07
Training practice–0.024 (–0.032 to –0.015)–0.06
Practice population characteristics
Patient morbidity: limiting long-term illness0.67 (0.57 to 0.77)0.16
Patient ethnicity: white0.15 (0.13 to 0.17)0.15
  • This model explains 17.2% of the variation in antibiotic prescribing. All regression coefficients significant (P<0.001).