Table 1

 Intervention groups

IPrescribers in this group received no intervention
IIPrescribers in this group received, with explanation, graphical results of 3–4 months of audits of prescribing patterns within the region and within each health centre (audit and feedback)
IIIPrescribers in this group received audit and feedback; a copy of a prescribing guideline adapted by researchers from the WHO guideline for the effective management of STIs4 and attended two seminars on prescribing conducted by experts in prescribing
IVPrescribers in this group received audit and feedback plus routine face to face educational meetings with prescribing experts (academic detailing). In addition, this group also received a copy of the prescribing guideline described above