Study type: Epidemiological study (observational study)

Overall mortality of cellular telephone customers. epidem.

Published in: Epidemiology 1996; 7 (3): 303-305

Aim of study (acc. to author)

The overall mortality of cellular telephone customers was investigated in a study conducted in the USA.

Further details

Two different types of cellular phones were included in the study: the portable model where the antenna is located together with the battery in a box separately from the hand piece, and the handheld model which has the antenna in the hand piece in close proximity to the head during a call.

Endpoint/type of risk estimation

Type of risk estimation: (standardized mortality rate (SMR))

Exposure

Assessment

Exposure groups

Group Description
Group 1 portable cellular telephone users
Group 2 handheld mobile telephone users

Population

Study size

Type Value
Total 770,390
Eligible 255,868

Conclusion (acc. to author)

23 % of the customers had a handheld mobile phone, 19 % had a portable mobile phone; telephone type was unknown for the remaining 58 %. 604 deaths occurred among the cohort members during 1994. The overall mortality rates for portable and handheld cellular phone users were similar and much lower than corresponding rates for the general population. The low mortality probably reflects the higher socioeconomic status of cellular phone customers.

Limitations (acc. to author)

A substantial proportion of the original cohort had to be excluded due to missing information. The time between exposure to cellular phones and the death endpoints was short, so the study addressed only short-term effects.

Study funded by

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