Arroll 2002.

Methods	RCT unit of allocation: patient unit of analysis: patient power calculation: done concealment of allocation: done follow up of patients: done blinded assessment of outcome: not done baseline measurement: not applicable reliable primary outcome measure:done protection against contamination: not applicable analysis appropriate: yes
Participants	129 patients from practices of 15 family physicians in New Zealand with common cold where physician thought patient wanted an antibiotic
Interventions	1. Delayed treatment with antibiotics ‐ patient received prescription for antibiotic and instructed to fill it after 3 days if symptoms not improving 2. Patient received immediate prescription for antibiotic from physician
Outcomes	Professional practice: none Patient: antibiotic use by patient, daily temperature symptom score
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	A ‐ Adequate