In medical studies, treatments are tested within a group of study participants. You will be given a sentence of a study report in which your task is to list the phrases that give information about the participants of the study. You should list the phrases in the same order that they appear in the text, separated by commas. If no information about the participants is mentioned, just output "not found". Relevant information about participants include: gender, medical conditions, location, number of people participating. Do not contain participant mentions without relevant information.

[Q]: Outcomes improved with regular class attendance .
[A]: not found


[Q]: A precycle risk score from > or =25 to < 40 for a given patient was identified as being the optimal threshold for sensitivity ( 58.0 % ) and specificity ( 78.7 % ) .
[A]: not found


[Q]: We conclude that granisetron is a better anti-emetic than perphenazine for the long-term prevention of post-operative vomiting in children undergoing general anaesthesia for tonsillectomy .
[A]:
children undergoing general anaesthesia for tonsillectomy