Table 2. Association between QP and antibiotic prescribing, N = 6251
Model without adjustment for practice characteristicsModel with adjustment forpractice characteristics
Co-efficient95% CICo-efficient95% CI
LowerUpperLowerUpper
2015–2016 QP-0.172-0.176-0.168-0.166-0.170-0.162
Months since QP0.0140.0130.0140.0140.0130.014
SeasonWinterRefRefRefRefRefRef
Spring-0.040-0.043-0.038-0.044-0.046-0.041
Summer-0.153-0.156-0.150-0.139-0.142-0.136
Autumn-0.132-0.135-0.129-0.119-0.121-0.116
ComorbiditiesRespiratory disease0.0210.0180.024
Diabetes prevalence0.0280.0260.030
Benzodiazepine anxiolytics prescription0.1230.1180.127
Benzodiazepine hypnotics prescription0.1600.1570.164
GPHC per 10 000 patients(spline terms)GPHC1 (<4.91)0.0130.0110.015
GPHC2 (≥4.91 to ≤9.80)-0.008-0.010-0.006
GPHC3 (≥9.81 to ≤14.72)0.070.0020.011
GPHC4 (>14.72)-0.006-0.0210.008
  • Effects of GPHC are per one increase in GP number per 10 000 patients within each spline term. GPHC = GP headcount. QP = Quality Premium.