Table 2. Summary results of all item antibiotic prescribing rates (primary outcome).

Primary outcome	Baseline Mean		Follow-Up Mean		Difference in Rate (95% CI)	P-Value	% Reduction from Baseline a (95% CI)
	Control	Intervention	Control	Intervention
All antibiotic items/100 claims	8.3	8.5	7.9	7.5	-0.47 (-0.85, -0.09)	0.014	-5.7% (-10.2%, -1.1%)
Intervention components	No BCM Intervention	BCM Intervention	No BCM Intervention	BCM Intervention
BCM intervention versus no BCM intervention	8.5	8.5	7.7	7.2	-0.51 (-0.86, -0.16)	0.005	-6.1% (-10.4%, -1.9%)
	No HB Comparator	HB Comparator	No HB Comparator	HB Comparator
HB comparator versus no HB comparator	8.4	8.6	7.5	7.4	-0.36 (-0.72, 0.01)	0.057	-4.3% (-8.6%, 0.1%)
	0,6,9 mo A&F	0,6 mo A&F	0,6,9 mo A&F	0,6 mo A&F
0,6 mo A&F versus 0,6,9 mo A&F	8.2	8.7	7.3	7.6	0.002 (-0.35, 0.35)	0.989	0.02% (-4.2%, 4.2%)

^a All percentages standardised using control group baseline mean prescribing rate (8.3)

BCM, written behaviour change message; HB, health board; A&F, audit and feedback