Table 2.

Comparison of parents and adolescents who participated in the field study to non- participants (data from the short questionnaire)

Variable	Participants	Non-participants
	Prevalence n (%)	Prevalence n (%)	p-value
Parents of the children	n = 1477	n = 628
Sex			0.29
male	359 (24.3)	139 (22.2)
Level of education
at least 12 years of education	748 (51.0)	250 (40.4)	<0.0001
Nationality (mother)			<0.0001
German	902 (85.6)	347 (72.0)
Mobile phone ownership			0.02
	1365 (92.9)	562 (89.8)
Use of a mobile phone per day			0.16
< 5 minutes	1057 (72.4)	475 (76.4)
> 5 minutes	404 (27.7)	147 (23.7)
Self-reported concerns about adverse health effects to EMF			<0.0001
not or little concerned	580 (55.4)	350 (72.5)
fairly concerned	386 (36.9)	103 (22.0)
deeply concerned	80 (7.7)	27 (5.6)
Self-estimated distance to the next base station			<0.0001
Don't know	39 (2.7)	136 (22.0)
< 500 meters	945 (56.3)	303 (49.0)
= 500 meters	464 (32.0)	179 (29.0)
Adolescents	n = 1508	n = 814
Sex			0.009
male	730 (48.4)	440 (54.1)
Level of education
grammar school	743 (49.9)	253 (31.2)	<0.0001
Nationality (mother)			<0.0001
German	946 (85.1)	465 (74.9)
Mobile phone ownership			0.004
	1373 (91.2)	711 (87.4)
Use of a mobile phone per day			0.25
< 5 minutes	1153 (77.1)	593 (73.6)
> 5 minutes	343 (22.9)	213 (26.5)
Self-reported concerns about adverse health effects to EMF			<0.0001
not or little concerned	969 (87.7)	572 (92.1)
fairly concerned	120 (10.9)	38 (6.1)
deeply concerned	17 (1.5)	11 (1.8)
Self-estimated distance to the next base station			<0.0001
don't know	47 (3.2)	139 (17.3)
< 500 meters	922 (62.6)	390 (48.5)
= 500 meters	503 (34.2)	274 (34.1)

EMF: electromagnetic fields