The study population of 253 customers was surveyed by post. Since the survey was fairly small, respondents were notified by telephone in advance. All 253 customer addresses already included telephone numbers. All 253 pharmacies could be reached within five working days. An attempt was made to talk to the pharmacy manager. If this was not possible, the member of staff was asked to inform the pharmacy manager about the intended research and to tell them that the questionnaire would arrive the following day.
Statistical analysis was performed using SPSS 16.0. The significance tests were based on a 95% confidence interval. The chi-square test was also used.