Table 4

The association between GP characteristics and mean antibiotic prescribing in RTIs by means of linear regression analysis.

95% CI
GP characteristics
Sex
Years of practice3.601.20 to 6.00
List size
Medical knowledge on RTIs0.630.01 to 1.26
Visits from drug representatives
Perceived time per patient0.710.18 to 1.24
Interaction terms
Sex × list sizea0.340.09 to 0.59
Years of practice × medical knowledge on RTIsb−2.37−4.3 to −0.42
Years of practice × visits from drug representativesc0.25−0.00 to 0.51
Years of practice × perceived time per patientd−1.32−2.48 to −0.17
  • Explained variance: 0.29.

  • a Female GPs having more patients enlisted, prescribe antibiotics more frequently.

  • b The longer the years of practice and the less a GP knows about RTIs, the more frequently a GP prescribes antibiotics.

  • c The longer the years of practice and the more drug representatives seen by a GP, the more frequently a GP prescribes antibiotics.

  • d The longer the years of practice and the less time perceived by the GP to be available per patient, the more frequently a GP prescribes antibiotics. RTI = respiratory tract infection.