Table 4.

Unadjusted and adjusted RR of total CDI incidence compared with rates of pre-defined high-risk antibiotic groups

	Unadjusted	Adjusted
High-risk antibiotic GP prescribing (log items per 1000)	RR (95% CI)	RR (95% CI)	P value
Co-amoxiclav	1.1200 (1.0451–1.2005)	1.0803 (0.9993–1.1682)	0.054
Cephalosporins	1.2456 (1.1715–1.3250)	1.0638 (0.9858–1.1485)	0.111
Clindamycin	1.1485 (1.0707–1.2319)	1.0787 (1.0014–1.1618)	0.046
Quinolones	1.2798 (1.1690–1.4015)	1.0125 (0.9180–1.1168)	0.805

Adjusted models are adjusted for financial year, health board, percentage of patients aged ≥65 years, social deprivation score (percentage of registered patients living in the most deprived areas), PPI (per 1000 items per 1000 registered patients) and percentage of patients with COPD, diabetes and hypertension.