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Does paternal occupational lead exposure increase the risks of low birth weight or prematurity?
S Lin1, S A Hwang, E G Marshall
1Bureau of Environmental and Occupational Epidemiology, New York State Department of Health, Albany 12203, USA.
Insights
Paternal occupational lead exposure may increase risks for low birth weight and prematurity, especially with longer exposure durations. This study examined birth outcomes in relation to fathers' lead exposure levels.
Area of Science:
- Environmental Health
- Reproductive Toxicology
- Occupational Medicine
Background:
- Paternal occupational exposures are increasingly recognized as potential contributors to adverse birth outcomes.
- Lead is a known reproductive toxicant, but its specific impact via paternal exposure requires further elucidation.
- Understanding these risks is crucial for developing targeted workplace safety interventions.
Purpose of the Study:
- To investigate the association between paternal occupational lead exposure and adverse birth outcomes, specifically low birth weight and prematurity.
- To determine if the duration of lead exposure influences the risk of these outcomes.
- To provide data for occupational health guidelines concerning lead exposure.
Main Methods:
- A retrospective cohort study design was employed, utilizing New York State birth certificate data from 1981-1992.
- The study compared birth weight and gestational age between offspring of lead-exposed male workers (n=4,256) and a control group of male bus drivers (n=2,318).
- Statistical analyses included risk ratio calculations and adjustments for multiple potential confounding factors.
Main Results:
- No statistically significant differences in birth weight or gestational age were observed between the overall exposed and control groups.
- However, fathers with elevated blood lead levels for over 5 years had a significantly higher risk of fathering a child with low birth weight (RR=3.85) and prematurity (RR=2.45).
- The risk of low birth weight and prematurity increased proportionally with the duration of paternal lead exposure.
Conclusions:
- Prolonged paternal occupational lead exposure, particularly exceeding 5 years, is associated with an increased risk of low birth weight and prematurity.
- The findings underscore the importance of managing occupational lead exposure for male workers of reproductive age to protect offspring health.
- Limitations include the inability to control for all potential maternal and paternal confounders, such as pregravid weight and nutritional status.
Abstract:
The relation between paternal occupational lead exposure and low birth weight/prematurity was examined in a retrospective cohort study. Birth weight and gestational age (1981-1992), obtained from New York State birth certificates, were compared between lead-exposed and nonexposed workers. The exposed group (n = 4,256) consisted of births to male workers of reproductive age reported to the New York State Heavy Metals Registry. The control group (n = 2,318) consisted of the offspring of a random sample of male bus drivers, frequency matched by age and residence. There were no statistically significant differences in birth weight or gestational age between the exposed and the control groups. However, workers who had elevated blood lead levels for more than 5 years had a higher risk of fathering a child with low birth weight (risk ratio = 3.85, 95% confidence interval 1.5-9.88) or prematurity (risk ratio = 2.45, 95% confidence interval 1.03-5.84) than did controls after adjustment for paternal age, low maternal education, race, residence, gravidity, maternal spontaneous abortion history, perinatal complications, adequacy of prenatal care, and infant gender. The risks of low birth weight and prematurity increased with the duration of exposure to lead. Our results were limited by the inability to control for some potential confounders, such as pregravid underweight and maternal nutrition status.