|Reference group 1||cell phone use: 0 years|
|Group 2||cell phone use: 1-2 years|
|Group 3||cell phone use: 3-6 years|
|Reference group 4||cell phone use: 0 hours/month|
|Group 5||cell phone use: 1-2.5 hours/month|
|Group 6||cell phone use: > 2.5 hours/month|
|Reference group 7||total hours of use: 0|
|Group 8||total hours of use: 1-60|
|Group 9||total hours of use: > 60|
|Group 10||cell phone handedness left - tumor laterality left|
|Group 11||cell phone handedness left - tumor laterality right|
|Group 12||cell phone handedness right- tumor laterality left|
|Group 13||cell phone handedness right - tumor laterality right|
18 cases (20%) and 23 controls (26,7%) reported regular use of handheld cellular telephones.
The risk of acoustic neuroma was not associated with use of cellular telephones. The tumor more often occurred on the contralateral than ipsilateral side of the head.
No conclusions can be drawn for long-term users, since the study was conducted about 10 years after introduction of cellular telephone technology.