perhaps if you give more information like how your study has been designed, who qualifies, how the results will be used, etc. you might get a better response. You use a fairly broad term like "symptoms" and that raises a flag. Read around the board just a little bit and you'll see that there is no such thing as one set of symptoms for IBS. Like Sherlock, I'm fairly suspicious of this approach and would need a lot more info before responding.