The relation between use of cellular telephones and the risk of non-Hodgkin lymphoma was investigated in a population-based, multicenter case-control study in the USA.
| Group | Description |
|---|---|
| Reference group 1 | lifetime usage of cell phone: never |
| Group 2 | lifetime usage of cell phone: ever |
| Group 3 | lifetime usage of cell phone: < 10 times |
| Group 4 | lifetime usage of cell phone: 10-100 times |
| Group 5 | lifetime usage of cell phone: > 100 times |
| Group 6 | total years of use over lifetime: 1 - 2 years |
| Group 7 | total years of use over lifetime: 3 - 5 years |
| Group 8 | total years of use over lifetime: 6 - 8 years |
| Group 9 | total years of use over lifetime: > 8 years |
| Group 10 | average number of minutes per week of use: 1 - 20 min |
| Group 11 | average number of minutes per week of use: 21 - 60 min |
| Group 12 | average number of minutes per week of use: > 60 min |
| Group 13 | cumulative lifetime hours of use: ≤ 78 hours |
| Group 14 | cumulative lifetime hours of use: 79 - 208 hours |
| Group 15 | cumulative lifetime hours of use: > 209 hours |
| Group 16 | years of first use: 1984 - 1994 |
| Group 17 | years of first use: 1995 - 1996 |
| Group 18 | years of first use: 1997 + |
| Cases | Controls | |
|---|---|---|
| Eligible | 905 | 978 |
| Participants | 551 | 462 |
| Participation rate | 79 % | 55 % |
Less than 5 % of the participants reported duration of use of cellular telephones of six or more years or lifetime cumulative use of 200 or more hours.
No relationship between minutes of weekly or cumulative hours of lifetime use of cellular telephones and the risk of non-Hodgkin lymphoma was found. A non-significant increase in risk of non-Hodgkin lymphoma among men who reported using cellular phones for 8 or more years was observed (based on 7 cases).
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