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The original CHAT paper had a total of 226 subjects in the surgery arm (early adenotonsillectomy), however in the version 11, there are only 224 subjects in the surgery arm using variable 'had_surgery'. Is there an explanation for the different number of subjects? Is there another surgery arm variable I should use?
I'm guessing had_surgery also includes subjects who crossed over from the watchful waiting arm. Some subjects randomized to surgery did not ultimately have surgery, too.