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Investigation of Spontaneous Abortion among Video Display Terminal Users.

PB91189209

Publication Date	1991
Personal Author	Schnorr, T. M.; Grajewski, B. A.; Hornung, R. W.; Thun, M. J.; Egeland, G. M.
Page Count	38
Abstract	NIOSH conducted a study of 2,430 female telephone operators to determine if exposure to electromagnetic fields emitted by video display terminals (VDT's) were associated with increased risk of spontaneous abortion. Exposure levels were determined using company records of weekly hours of VDT use and measurements of electromagnetic fields at VDT workstations. Operators who used VDT's had higher abdominal exposure to very low frequency (VLF) (15 kHz) electromagnetic. Workstations without VDT's did not emit VLF energy. Abdominal exposure to extremely low frequency (ELF) (45 to 60Hz) was similar for operators who used VDT's and those who did not. The authors found no excess risk of spontaneous abortion for VDT use in the first trimester of pregnancy and no dose-response relationship resulting from weekly hours of VDT use. Significant associations were found for other risk factors e.g. cigarette smoking, thyroid disorder, alcohol consumption. The potential association of spontaneous abortion and physical or psychological stress could not be addressed in the study design. The authors conclude that VDT use and exposure to the accompanying electromagnetic fields were not associated with an increased risk of spontaneous abortion in the study.
Keywords	Missed abortion Occupational safety and health Electromagnetic fields Reproductive disorders First pregnancy trimester Smoking Alcohol drinking Risk factors Thyroid diseases Statistical analysis Occupational exposure Females Radiation hazards Video display terminals(VDT) Spontaneous abortion Miscarriage
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	44G - Environmental & Occupational Factors 94D - Job Environment 41I - Job Environment 57V - Radiobiology 57S - Physiology
Corporate Authors	National Inst. for Occupational Safety and Health, Cincinnati, OH.; American Cancer Society, Inc., Atlanta, GA.
Supplemental Notes	Prepared in cooperation with American Cancer Society, Inc., Atlanta, GA.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199116

Investigation of Spontaneous Abortion among Video Display Terminal Users.

Investigation of Spontaneous Abortion among Video Display Terminal Users.
PB91189209

Publication Date	1991
Personal Author	Schnorr, T. M.; Grajewski, B. A.; Hornung, R. W.; Thun, M. J.; Egeland, G. M.
Page Count	38
Abstract	NIOSH conducted a study of 2,430 female telephone operators to determine if exposure to electromagnetic fields emitted by video display terminals (VDT's) were associated with increased risk of spontaneous abortion. Exposure levels were determined using company records of weekly hours of VDT use and measurements of electromagnetic fields at VDT workstations. Operators who used VDT's had higher abdominal exposure to very low frequency (VLF) (15 kHz) electromagnetic. Workstations without VDT's did not emit VLF energy. Abdominal exposure to extremely low frequency (ELF) (45 to 60Hz) was similar for operators who used VDT's and those who did not. The authors found no excess risk of spontaneous abortion for VDT use in the first trimester of pregnancy and no dose-response relationship resulting from weekly hours of VDT use. Significant associations were found for other risk factors e.g. cigarette smoking, thyroid disorder, alcohol consumption. The potential association of spontaneous abortion and physical or psychological stress could not be addressed in the study design. The authors conclude that VDT use and exposure to the accompanying electromagnetic fields were not associated with an increased risk of spontaneous abortion in the study.
Keywords	Missed abortion Occupational safety and health Electromagnetic fields Reproductive disorders First pregnancy trimester Smoking Alcohol drinking Risk factors Thyroid diseases Statistical analysis Occupational exposure Females Radiation hazards Video display terminals(VDT) Spontaneous abortion Miscarriage
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	44G - Environmental & Occupational Factors 94D - Job Environment 41I - Job Environment 57V - Radiobiology 57S - Physiology
Corporate Authors	National Inst. for Occupational Safety and Health, Cincinnati, OH.; American Cancer Society, Inc., Atlanta, GA.
Supplemental Notes	Prepared in cooperation with American Cancer Society, Inc., Atlanta, GA.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199116