All patients had their clinical blood pressure measured with a mercury sphygmomanometer, then a 24-hour ambulatory blood pressure monitoring (ABPM) using a Suntech Oscar 2, USA machine with a measuring interval of every 30 minutes at day time from 6 AM to 10 PM and every 60 minutes at night time from 10 PM to 6 AM the next day and were tested the microalbuminuria on the same day with ABPM.