st: Bar graph with IQR bars

["Gallego Angel, Juan" <jgallego@nshs.edu>]

Hello, 

How do I create a bar graph with IQR bars? I am plotting medians since my data is not normally distributed. 
My outcome is rate of antipsychotic use (percent) and want to show the rates in four regions over four different decades. For example, rate in US, europe, asia and africa in 1970s, 1980s, 90s and 200s. 
I tried doing that with the graph bar command but I couldn't figure out how to add the IQR bars. 

Thanks, 

Juan 

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