Effect of occupational noise on the course and outcome of pregnancy.
研究职业噪声对妊娠的影响，发现噪声暴露≥90分贝时新生儿出生体重下降，且与站立工作或轮班工作共同作用时影响更明显。
OBJECTIVES: The goal of this investigation was to examine the effects of occupational noise during pregnancy prospectively. METHODS: The exposed group [continuous A-weighted sound level (LAeq(8 h)) > or = 78 dB] consisted of 111 pregnant women, and the reference group comprised 181 pregnant women with approximately similar work conditions but without noise exposure. The noise-exposed women had more frequently other inconveniences in their work, however, like shift work, impulse noise exposure, vibration, and a high or low temperature. RESULTS: With the limit of 78 dB (LAeq (8 h)), the course and outcome of pregnancy did not differ between the groups. When the noise exposure was 90 dB (LAeq (8 h)) or more, a decline in birthweight, either absolute [mean 3304 (SD 585) g for the exposed versus mean (SD 548) g for the unexposed, 95% CI of mean difference -471--+15 g] or related to the gestational age (below the 10th percentile [5 of 25 (20%) versus 13 of 180 (7%)]), was seen. These findings were more pronounced if the woman was simultaneously exposed to a standing work position or shift work. CONCLUSIONS: Working in high noise exposure can be considered a form of risk during pregnancy.