Exposure to magnetic fields and the risk of poor sperm quality.
Published in: Reprod Toxicol 2010; 29 (1): 86-92
Aim of study (acc. to author)
Case or control status was determined by
semen analyses of two specimens per participant according to the WHO criteria for poor semen quality. The magnetic field exposure was assessed by 24-h measurement on a typical day of the 3 months period representing the cycle length for spermatogenesis. The cutpoint 90th percentile was defined as the magnetic field level above which 10 % of all 24-h measurements had a higher value. The 90th percentile was 0.16 µT (1.6 mG) and corresponded to 2.4 h of the exposure period (10% of 24 h). Endpoint/type of risk estimation
Type of risk estimation:
(odds ratio (OR))
measurement: 24-h measurement of
magnetic field level of 40 - 1000 Hz at a rate of every four seconds calculation: 90th
percentile Exposure groups
Reference group 1
magnetic field level at 90th percentile: < 0.16 µT
magnetic field level at 90th percentile: ≥ 0.16 µT
Reference group 3
duration of magnetic field exposure ≥ 0.16 µT: < 1 h
duration of magnetic field exposure ≥ 0.16 µT: 1 - 3 h
duration of magnetic field exposure ≥ 0.16 µT: 3 - 6 h
duration of magnetic field exposure ≥ 0.16 µT: > 6 h
China ( Shanghai metropolitan area)
Statistical analysis method:
conditional logistic regression
season of enrollment, marital status
Conclusion (acc. to author)
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