Table 6.
ORs for childhood leukemia according to nighttime § ELF-MF exposure (CLR—Adjusted *).
| All Leukemias | Acute Lymphocytic Leukemia | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Exposure Metric | Level (μT) | Cases | Controls | OR | 95% CI | Cases | Controls | OR | 95% CI |
| AM continuous | per 1 μT increase | 409 | 569 | 0.62 | 0.13–2.90 | 356 | 499 | 0.79 | 0.15–4.11 |
| AM categorical | ≤0.1 | 375 | 531 | 1.00 | - | 326 | 466 | 1.00 | - |
| (0.1–0.2] | 26 | 24 | 1.57 | 0.85–2.90 | 22 | 20 | 1.54 | 0.80–2.96 | |
| >0.2 | 8 | 14 | 0.67 | 0.27–1.68 | 8 | 13 | 0.74 | 0.29–1.89 | |
| GM categorical | ≤0.1 | 377 | 534 | 1.00 | - | 327 | 468 | 1.00 | - |
| (0.1–0.2] | 28 | 21 | 1.87 | 1.01–3.45 | 25 | 18 | 1.87 | 0.98–3.56 | |
| >0.2 | 4 | 14 | 0.32 | 0.10–1.00 | 4 | 13 | 0.36 | 0.11–1.13 | |
| P95 (3 levels) | ≤0.1 | 352 | 493 | 1.00 | 307 | 433 | 1.00 | - | |
| (0.1–0.2] | 37 | 46 | 1.12 | 0.68–1.83 | 31 | 41 | 1.01 | 0.59–1.72 | |
| >0.2 | 20 | 30 | 0.84 | 0.45–1.54 | 18 | 25 | 0.92 | 0.48–1.77 | |
| P95 (4 levels) | ≤0.1 | 352 | 493 | 1.00 | - | ||||
| (0.1–0.2] | 37 | 46 | 1.11 | 0.67–1.82 | |||||
| (0.2–0.3] | 15 | 11 | 2.29 | 0.95–5.50 | |||||
| >0.3 | 5 | 19 | 0.28 | 0.10–0.77 | |||||
§ Nighttime = from 10 pm to 5:59 am; * CLR—Adjusted= conditional logistic regression models, adjusted for parents’ education; AM = arithmetic mean of instantaneous values from nighttime bedroom measurements; GM = geometric mean of instantaneous values from nighttime bedroom measurements; P95 = 95th percentile of instantaneous values from nighttime bedroom measurements.