Seventy-two controls were enrolled in the study, only one patient refused to answer the questionnaire.
Students enrolled in more than one of the three classes were excluded from evaluation of each class as a potential risk factor.
Four of the enrolled subjects were excluded from analysis due to lack of complete baseline data.
Of the 26 patients enrolled, 12 underwent three-dimensional echocardiographic examination within 24 hours of resonance imaging, and 14 within 48 hours.
Finally, participants were enrolled from a number of sites in a non-random manner.
The female students already enrolled protested this sudden ban, with limited success.
The study enrolled nearly 250 children between the ages of 14 and 15, and more than 80% completed the study.
Medical men, clergy, professionals and traders were prominent with various members of the aristocracy, gentry and clergy being enrolled as vice-presidents and patrons.