Table 2 Associations between RF-EMF exposures and ‘Headache’ (symptom)
Symptom | Symptom categories (N for unadjusted model/N for adjusted model) | Exposure | Exposure categories (N for unadjusted model/N for adjusted model) | Unadjusted OR (95% CI) for each exposure category | Adjusted OR (95% CI) for each exposure category | Confounders in model |
|---|---|---|---|---|---|---|
Headache | No, hardly ever (204/194) | Cordless calls > 10 mins. made and rec’d weekly | 0 (64/59) | 1 | 1 | Cold/flu*+ |
1 or 2 weekly (87/84) | 1-2 (104/103) | 1.27 (0.90-1.77) | 1.28 (0.90-1.83) | Woken by phone+ | ||
3 or 4 weekly (25/24) | 3-9 (84/78) | 1.40 (0.98-1.98) | 1.35 (0.92-1.96) | Light out time | ||
Most days (16/15) | 10-120 (80/77) | 1.76 (1.23-2.51)* | 1.41 (0.95-2.09) | |||
Headache | No, hardly ever (216/216) | Minutes on cordless phone daily | 0-4 (148/148) | 1 | 1 | Cold/flu**+ |
1 or 2 weekly (89/89) | 5-15 (104/104) | 0.83 (0.49-1.41) | 0.78 (0.45-1.32) | |||
3 or more times weekly (43/43) | 16-240 (96/96) | 1.88 (1.14-3.12) | 1.74 (1.05-2.90) | |||
Headache | No, hardly ever (218/213) | Cellphone calls >10 minutes weekly | 0 (277/271) | 1 | 1 | Cold/flu**+ |
1 or 2 times weekly (91/91) | 1-6 (66/66) | 1.27 (0.95-1.69) | 1.14 (0.84-1.53) | Woken by phone*+ | ||
3 or 4 times weekly (29/29) | 7-35 (12/12) | 2.37 (1.21-4.62) | 2.40 (1.19-4.83) | |||
Most days (17/16) | ||||||
Headache | No, hardly ever (-/215) | Cellphone headset | No (320) | Model invalid | 1 | Cold/flu**+ |
1 or 2 weekly (-/91) | Wired (16) | 1.29 (0.71-2.36) | Woken by phone | |||
3 or more weekly (-/43) | Wireless (13) | 2.23 (1.10-4.53) | Light out time | |||
Headache | No, hardly ever (-/93) | Cordless phone frequency | Not exposed (-/28) | Model invalid | 1 | Cold/flu**+ |
1 or 2 weekly (-/38) | ≤ 900 MHz (-/19) | 1.04 (0.38-2.90) | Woken by phone | |||
3 or more weekly (-/14) | 1.8-1.9 GHz (-/27) | 1.42 (0.61-3.34) | ||||
2.4 GHz (-/53) | 0.74 (0.34-1.63) | |||||
5.8 GHz (-/18) | 1.55 (0.61-3.96) |