An audit and feedback intervention study increased adherence to antibiotic prescribing guidelines at a Norwegian hospital

Table 4 Monthly prescribing of appropriate empirical antibiotics and total treatment duration, estimated with interrupted times series

	Appropriate empirical antibiotics^a			Total treatment duration
	Percent	P-value	SE	Days	P-value	SE
Intercept β₀	68.3		5.3	11.5		0.4
Trend before intervention β₁	−1.3	ns	0.9	−0.07	ns	0.1
Effect one month after intervention β₂	14.1	ns	8.5	−1.4	0.04	0.9
Effect six month after intervention β₂	45.4	0.002	11.0	0.57	ns	0.8
Trend change after intervention β₃	4.1	0.02	2.9	0.27	0.03	0.14

Trends pre- and post intervention, and effect of the intervention on prescribing one and six months after the intervention (level change) are reported
^aComprise benzylpenicillin in monotherapy, benzylpenicillin in combination with gentamicin, or amoxicillin/ampicillin, ns; data is considered non-significant when P > 0.05, SE Standard error

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