研究のタイプ: 疫学研究 (observational study)

[中国の福州におけるプラスチック溶接機の生殖年齢の女性オペレータに対する電磁界の健康影響] epidem.

Health Effects of Electromagnetic Fields on Reproductive-Age Female Operators of Plastic Welding Machines in Fuzhou, China.

掲載誌: J Occup Environ Med 2016; 58 (2): 148-153

この研究は、靴製造工場におけるプラスチック溶接機の女性オペレータ180人を電磁界(EMFs)ばく露群、付近のスーパーマーケットの女性従業員349人を非ばく露群として、EMFsの健康影響を調査した。その結果、プラスチック溶接機周辺の平均電界強度は51.3-368.9V/mの範囲であった;自律神経系症状有病率はEMFsの高ばく露群で有意に増加した;月経異常有病率は、非ばく露群12.0%、低ばく露群26.8%、高ばく露群33.8%で有意差が見られた;血清プロゲステロンばく露群で有意に低かった、と報告している。

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研究の目的(著者による)

A cross-sectional study was conducted in China to investigate the health effects of electromagnetic fields among female operators of plastic welding machines in shoe factories.

詳細情報

Female workers were recruited from supermarkets near the factories as the unexposed control group.

影響評価項目/リスク推定のタイプ

リスク推定のタイプ:

ばく露

ばく露評価

ばく露集団

グループ 説明
参照集団 1 control group: not exposed
集団 2 factories with low exposure: < 150 V/m
集団 3 factories with high exposure: ≥ 150 V/m
参照集団 4 cumulative exposure level: 0 years-V/m
集団 5 cumulative exposure level: 0 - 499 years-V/m
集団 6 cumulative exposure level: 500 - 999 years-V/m
集団 7 cumulative exposure level: ≥ 1000 years-V/m

調査対象集団

調査規模

タイプ
合計 529
その他:

180 female operators in shoe fabrics and 349 female workers in supermarkets

統計学的分析方法:

結論(著者による)

No electric fields were detectable in the supermarkets (≥ 1 V/m). The mean electric field strengths in the frequency range from 25 MHz to 30 MHz in the vicinity of the welding machines in the five factories ranged from 51.3 to 368.9 V/m and exceeded the national standard of 25 V/m. The levels of magnetic field strength ranged from 0.02 A/m to 0.06 A/m below the reference values.
The prevalence of neurovegetative symptoms increased with higher electric field exposures. The prevalence of menstrual disorder was 12.0% in the unexposed group, but was significantly increased in the low exposure group < 150 V/m (26.8%) and in the high exposure group ≥ 150 V/m (33.8%). In the groups with cumulative exposure, the prevalence of most neurovegetative symptoms and menstrual abnormalities increased with higher cumulative exposure. No significant associations between adverse reproductive outcomes and occupational exposure were observed among the female workers. Serum progesterone was significantly lower in the exposed groups compared to the control group.
The authors concluded that occupational exposure to electromagnetic fields of plastic welding machines in shoe factories was associated with adverse health effects, including subjective symptoms, menstrual disorder and low level of serum progesterone among female operators.

研究助成

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