A case-control study was conducted in Thailand to investigate the contribution of cellular telephone use and other factors to the etiology of leukemia.
High risk among cellular telephone users was denoted by the presence of at least one of the three following factors: ≥ 75 % of time initiating calls, ≥ 75 % of time extending antennas, or wearing metal glasses at least some of time.
| Group | Description |
|---|---|
| Reference group 1 | no cellular telephone use |
| Group 2 | cellular telephone use |
| Group 3 | cellular telephone use: low risk |
| Group 4 | cellular telephone use: high risk |
| Group 5 | service provider: GSM |
| Group 6 | service provider: other |
| Group 7 | GSM exclusive use |
| Group 8 | GSM exclusive use: low risk |
| Group 9 | GSM exclusive use: high risk |
| Group 10 | use of hair dryers |
| Group 11 | use of computers |
| Group 12 | use of cordless telephones |
| Group 13 | use of microwave ovens |
| Group 14 | use of other electric appliances |
| Group 15 | live near powerlines |
| Group 16 | work with or near powerlines |
| Cases | Controls | |
|---|---|---|
| Eligible | 170 | 756 |
| Participants | 170 | 756 |
Overall, there was no clear association with cellular telephone use and leukemia. There was a suggestion that risk may be increased for those with certain usage practices (group 4) and those who used GSM service (group 5). There was no significant association with the use of household appliances or living near powerlines. Acute and chronic myeloid leukemia were significantly associated with working with or near powerlines, but these results were based on low numbers.
The duration of cellular telephone use was relatively short (median 24 - 26 months). Data of the intensity and duration of occupational exposure to power lines were not available.
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