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Figure 2 The use of beta-blockers over the study periods of both groups 1 (control) and 2 (guideline reminders). The bold vertical line indicates the beginning of the test period. The upper horizontal line inside the box represents the median value, and the lower horizontal line the mean value. The bottom of each box plot represents the 25th and 75th percentiles. The whiskers at the end of the horizontal lines represent the 95th percentiles. Solid circles = before guideline reminders were instituted; open circles = after guideline reminders were instituted; rectangular boxes = box plots before and after guideline reminders were instituted.
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