Study type: Epidemiological study (observational study)

Use of wireless telephones and serum S100B levels: a descriptive cross-sectional study among healthy Swedish adults aged 18-65 years. epidem.

Published in: Sci Total Environ 2009; 407 (2): 798-805

Aim of study (acc. to author)

A descreptive cross-sectional study was conducted in Sweden to investigate whether serum S100B protein levels were higher among frequent users than non-frequent users of mobile phones and DECT phones.

Further details

Serum S100B protein was used as a putative marker of blood-brain barrier dysfunction. The participants of the study were asked to answer a questionnaire and to leave a blood sample. The lowest quartile of overall use of mobile phones and DECT phones was taken as reference group including three non-users.

Endpoint/type of risk estimation

Type of risk estimation: (odds ratio (OR))



Exposure groups

Group Description
Group 1 mobile phone and DECT phone use
Group 2 mobile phone use
Group 3 analog mobile phone use
Group 4 digital mobile phone use
Group 5 UMTS mobile phone use
Group 6 DECT phone use


Study size

Type Value
Total 1,000
Participants 314
Participation rate 31 %
Statistical analysis method: ( adjustment: )

Conclusion (acc. to author)

All but three participants reported that they used a wireless phone. No association between higher serum S100B protein levels was observed among frequent users than non-frequent users of mobile phones and DECT phones.

Limitations (acc. to author)

Limitations of the study are the low participation rate and exposure assessment by questionnaire.

Study funded by

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