Childhood leukemia and 50 Hz magnetic fields: findings from the Italian SETIL case-control study.

Assuming a non-null exposure-outcome relationship, if the amount of random exposure error were indeed lower for the nighttime exposure metrics compared to the metrics based on complete 24–48 h measurements, both an overall increase in the ORs among the exposed, and a positive trend in risk estimates across increasing exposure levels, would be expected in such analyses.

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