st: Simple tab needed but multiple records

[Joseph Wagner <joseph.wagner@wright.edu>]

I realize this is going to sound simple and usually I can find my answer 
in the archives for statalist or elsewhere online but I am stumped on 
this one.  I have a dataset of x-ray records with multiple records per 
patient.  The records consist of id, age, and sex and I need to know how 
many persons had an x-ray when they were between the age of 17 and 25 
AND when when they were over 30.  My attempts have been crude and I know 
there has to be a simple yet elegent way to do this.

Thanks for you help.

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