Abstract: AIM: To explore the SAS macros implementation of trough/peak in ambulatory blood pressure with different kinds of records.METHODS: Implying procedure retain, SQL and cycling do, create macro procedure outputting statistical analysis report forms.RESULTS: After checked data entered into the SAS procedure, average difference of blood pressure values per hour in 24 hours after drug administration was created when running the macros. The whole trough/peak ratios of treatment and control groups were finally calculated.CONCLUSION: Trough/peak ratio required by clinician could be obtained by using macros dealing with ambulatory blood pressure with records exceeding 24 hours after taking medicine.

Key words: Ambulatory blood pressure, Trough/peak ratio, SAS implementation