Table 11.
Biological Gradient. Numbers of cases (Ca), controls (Co), and odds ratio (OR) with 95% confidence interval (CI) for cumulative duration of calls (hours) of wireless phones in quartiles in Hardell and Carlberg [38].
| Quartile | Mobile phone | Cordless phone | Wireless phone |
|---|---|---|---|
| OR, CI (Ca/Co) |
OR, CI (Ca/Co) |
OR, CI (Ca/Co) |
|
| First quartile, all | 1.27 1.05–1.54 (340/920) |
1.09 0.86–1.39 (174/478) |
1.15 0.94–1.42 (223/641) |
| Second quartile, all | 1.29 1.02–1.65 (198/492) |
1.23 0.97–1.57 (203/534) |
1.29 1.04–1.61 (235/596) |
| Third quartile, all | 1.36 1.04–1.78 (179/416) |
1.64 1.28–2.11 (210/451) |
1.37 1.08–1.72 (249/617) |
| Fourth quartile, all | 2.22 1.68–2.92 (228/320) |
2.35 1.78–3.10 (165/261) |
2.04 1.61–2.57 (367/618) |
|
| |||
| p, trend | <0.0001 | <0.0001 | <0.0001 |
First quartile 1–122 h; second quartile 123–511 h; third quartile 512–1,486 h; fourth quartile > 1,486 h.