TABLE 1.

Characteristics and Symptoms of Adolescent Participants Aged 12 to 19 Years (N = 1512): The Netherlands, 2007

	Mean (SD) or No. (%)
Mean age, y	14.7 (1.21)
Male	764 (50.5)
Secondary school type
Practical prevocational education	279 (18.5)
Theoretical prevocational education	472 (31.2)
Senior general secondary education	388 (25.6)
Preuniversity education	373 (24.7)
Dutch or Western migrant ethnicity	1306 (86.4)
Music exposure
Listens to music (in general)	1500 (99.2)
Music through earphones	1410 (93.3)
Portable music players (MP3 players)	1360 (89.9)
Nonportable music players (home stereos)	718 (47.5)
Discotheque visits (prior year)	1086 (71.8)
Pop concert visits (prior year)	649 (42.9)
Hearing symptoms
At least once in the prior month after listening to music through earphones	453 (30.0)
At least once in the prior year after going to a discotheque	888 (58.7)