Table 1. Tinnitus reported on the questionnaire and experienced in the sound booth.

		Tinnitus reported in the questionnaire		Total
		YES (GPA)	NO (GPB)
Tinnitus experienced in the sound booth (TB)	YES	46 (GPA + TB)	3 (GPB + TB)	49
	NO	47 (GPA − TB)	74 (GPB − TB)	121
	TOTAL	93	77	170

GPA: All adolescents who reported tinnitus in the questionnaire.

GPA + TB: Adolescents in GPA who also reported tinnitus in the acoustic booth.

GPA − TB: Adolescents in GPA who did not perceive tinnitus in the acoustic booth.

GPB: All adolescents who did not report tinnitus in the questionnaire.

GPB + TB: Adolescents in GPB who reported tinnitus in the acoustic booth.

GPB − TB: Adolescents in GPB who did not report tinnitus in the acoustic booth.