Study type: Epidemiological study (observational study)

Mobile phone use and subjective symptoms. Comparison of symptoms experienced by users of analogue and digital mobile phones. epidem.

Published in: Occup Med (Lond) 2001; 51 (1): 25-35

Aim of study (acc. to author)

A cross-sectional study was conducted in Sweden and Norway to test the hypothesis that GSM users experience more self-reported symptoms while using mobile phones than NMT users. Further results of the study are published in publication 9860.

Endpoint/type of risk estimation

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

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 NMT users
Group 2 GSM users
Reference group 3 NMT, calling time: < 2 min/day
Group 4 NMT, calling time: 2 - 15 min/day
Group 5 NMT, calling time: 15 - 60 min/day
Group 6 NMT, calling time: > 60 min/day
Reference group 7 GSM, calling time: < 2 min/day
Group 8 GSM, calling time: 2 - 15 min/day
Group 9 GSM, calling time: 15 - 60 min/day
Group 10 GSM, calling time: > 60 min/day
Reference group 11 NMT, < 2 calls/day
Group 12 NMT, 2 - 4 calls/day
Group 13 NMT, > 4 calls/day
Reference group 14 GSM, < 2 calls/day
Group 15 GSM, 2 - 4 calls/day
Group 16 GSM, > 4 calls/day

Population

Study size

Type Value
Total 16,990
Participants 10,631
Evaluable 6,392
Other:

NMT users: 2778; GSM users: 3614

Statistical analysis method:

Conclusion (acc. to author)

No increased risk for subjective symptoms for GSM users compared with NMT users was observed. A lower risk for sensations of warmth on the ear was found for GSM users compared with NMT users.
The hypothesis that GSM users experience more self-reported symptoms while using mobile phones than NMT users was nullified.

Study funded by

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