A meta-analytic study reported consistently higher rates of intrauterine fetal death and spontaneous abortions in flight attendants
; other rates of adverse pregnancy outcomes were not elevated.
Rates of induced abortions were lower, suggesting more effective use of birth control, which may affect the spontaneous fetal death rates.
One case-control study of women with endometriosis has suggested that the observed increased risk of developing endometriosis was potentially correlated with circadian dysrhythmia, radiation, and possibly environmental chemical exposures.