ECHO Review Explores Statistical Approaches for Investigating Periods of Susceptibility in Children’s Environmental Health Research

ECHO Review Explores Statistical Approaches for Investigating Periods of Susceptibility in Children's Environmental Health Research

Author(s): Jessie Buckley, Ghassan Hamra, and Joseph Braun

Who sponsored this study?

This research was supported by the Environmental influences on Child Health Outcomes (ECHO) program, Office of The Director, National Institutes of Health.

What were the study results?

We found that there are many different ways to study this topic. However, several new ways stand out as more advanced.*

*Results reported here are for a single study. Other or future studies may provide new information or different results. You should not make changes to your health without first consulting your healthcare professional.

What was the study's impact?

Learning about the ages that children are most likely to be affected by their environment is important. Knowing that information will help create programs, health practices, and policies that may help children better avoid things in their environment that can have a bad effect on them. This study finds recent improvements in ways of looking at which ages children are most affected. It also explains terms about this topic and why we need ways to study it.

Why was this study needed?

Many researchers are interested in studying the ages that children are most likely to be affected by environmental factors. There are many ways to study this topic, so we looked at several different ways to decide which ones were the best.

Who was involved?

There were no participants involved in this review. This is because we looked at different ways to use math to learn more information about a topic.

What happened during the study?

During this study, we reviewed different ways to study the age ranges that children are most likely to see effects from the environment around them. Environment is not just the outdoors, but other things about a child’s life, such as where they live, their family, what they eat, and more.

What happens next?

Our team will use this information to improve the design of future studies.

Where can I learn more?

Access the full journal article titled, “Statistical Approaches for Investigating Periods of Susceptibility in Children's Environmental Health Research.”

The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Published: March 2019

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ECHO Review Explores Statistical Approaches for Investigating Periods of Susceptibility in Children's Environmental Health Research

ECHO DISCOVERY

Co-Author Jessie Buckley presented Estimating effects of exposure mixtures on child health: Novel methods for solution-oriented ECHO research at a past ECHO Discovery webinar. You can view the presentation here.

MORE RESEARCH BY JESSIE BUCKLEY

Review of Prenatal Air Pollution Exposure and Brain Development

Author(s): Heather E. Volk, Frederica Perera, Joseph M. Braun, Samantha L. Kingsley, Kim Gray, Jessie Buckley, Jane E. Clougherty, Lisa A. Croen, Brenda Eskenazi, Megan Herting, Allan C. Just, Itai Kloog, Amy Margolis, Leslie A. McClure, Rachel Miller, Sarah Levine, Rosalind Wright

ECHO Review Finds No Strong Link Between Non-Persistent Chemical Exposures Found in Consumer Products and the Time It Takes Couples to Get Pregnant

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ECHO Review Finds No Strong Link Between Non-Persistent Chemical Exposures Found in Consumer Products and the Time It Takes Couples to Get Pregnant

Author(s): Alison E. Hipwell, Linda G. Kahn, Pam Factor-Litvak, et al

Who sponsored this study?

This research was supported by the Environmental influences on Child Health Outcomes (ECHO) program, Office of The Director, National Institutes of Health. This work was also supported by NIH grants P30 ES009089, R01ES013543, R01ES014393, R01ES08977, and T32ES023772.

What were the study results?

There were some signs that when either men, women, or both were exposed to certain chemicals, it took a longer for the couple to get pregnant. But more research needs to be done to truly understand those effects. There were also signs that certain chemicals did not have any effects.

*Results reported here are for a single review of specific studies during a 10-year period. Other or future studies may provide new information or different results. You should not make changes to your health without first consulting your healthcare professional.

What was the study's impact?

The papers we reviewed did not show a strong link between non-persistent chemicals and how long it takes to get pregnant. But, because there are not many studies like this, we concluded that more research is needed. While we wait for more research, it does not hurt to try to avoid certain chemicals in case they could affect the chances of becoming pregnant. We suggest common-sense lifestyle changes for men and women who would like to have a child. These include trying to avoid contact with certain non-persistent chemicals. Some ways to do this would be to use fewer plastic food containers and look at ingredient lists on personal care and cleaning products in order to avoid phthalates, parabens, TCS, benzophenones, and glycol ethers.

Why was this study needed?

Many products that people use contain non-persistent chemicals that can disrupt hormones. Non-persistent chemicals are chemicals that are broken down fairly quickly in the environment and in the human body. Therefore, non-persistent chemicals are often used in everyday household products. Some studies show these chemicals may affect people’s chance to get pregnant or may cause problems in pregnancy. These chemicals may also affect how long it takes for a couple to become pregnant, but not many studies have tried to answer this question. The goals of this study were to:

Review and summarize what is known about possible links between non-persistent chemicals and the time it takes to get pregnant.
To identify what information is missing in existing studies about this topic.
To present our results in a way that might change health policies and future research about chemicals in products that people use.

Who was involved?

This review looked at existing studies of healthy men and women who were in the age range to get pregnant. The studies were done in several different countries and ranged in size from 137 to 10,512 participants.

What happened during the study?

We used several sets of data to do a large search of research papers published from 2007 to 2017. We searched for articles about both common non-persistent chemicals and time to get pregnant. Our search found 3,456 articles. Two authors reviewed each of the articles we found to make sure they included information we needed. We found that 15 papers from 12 different studies, and then we pulled information from those for our review.

What happens next?

We are doing another review that will study whether there is a connection between chemicals that stay in the body for a long time and the time it takes to become pregnant.

Where can I learn more?

Access the full journal article titled, “Exposure to non-persistent chemicals in consumer products and fecundability: a systematic review” in Human Reproduction Update.

The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Published: January 1, 2019

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ECHO Review Finds No Strong Link Between Non-Persistent Chemical Exposures Found in Consumer Products and the Time It Takes Couples to Get Pregnant

ECHO Study Suggests Specific Form of Vitamin E Prevents, Treats Bronchopulmonary Dysplasia

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ECHO Study Suggests Specific Form of Vitamin E Prevents, Treats Bronchopulmonary Dysplasia

Author(s): Cosby Stone, Cynthia McEvoy, Judy Aschner, et al

Who sponsored this research?

This research was supported by the Environmental influences on Child Health Outcomes (ECHO) program, Office of The Director, National Institutes of Health.

What were the study results?

The researchers learned:

There was not enough information in existing studies to recommend using vitamin E to prevent BPD.
A specific type of vitamin E called α-tocopherol isoform may be helpful in preventing or treating BPD.

*Results reported here are for a single research review. Other or future reviews or studies may provide new information or different results. You should not make changes to your health without first consulting your healthcare professional.

What was the study's impact?

The researchers think that studying the vitamin E α-tocopherol isoform would help provide more information on the benefits and risks of using it to prevent and treat BPD. This type of vitamin E is already associated with better health outcomes for conditions such as asthma, allergic airway swelling, and improved lung growth than other forms of vitamin E. However, without further studies, there is not enough information to recommend it now.

Why was this study needed?

Bronchopulmonary dysplasia (BPD) is a chronic lung disease that mostly affects newborns and infants. It occurs when a newborn or infants’ lungs are damaged from being on a ventilator (a machine that provides oxygen). We already know that there is a connection between low levels of vitamin E and the risk of BPD. Some doctors use vitamin E to help prevent BPD in newborns and infants. However, the last time researchers studied how vitamin E may affect BPD was 1991. Since then, we have learned more about how to reduce the risk of oxygen and ventilator-related lung injuries in newborns. We also know more about how vitamin E affects overall lung health. People only get vitamin E through their diet or supplements, like vitamins, so it’s important to understand if people need more of it.

What was the purpose of the study?

To update our knowledge and understanding of vitamin E and BPD.

Who was involved?

No study participants were involved in this research. The researchers involved are experts in neonatology (the study of newborns), epidemiology (understanding health in certain populations of people), pulmonary medicine (medicine related to the lungs) and environmental interventions (how changing something in a person’s environment affects health.

What happened during the study?

Researchers gathered and analyzed existing research on vitamin E. From this analysis, they suggest ideas for future research that could help us learn more about vitamin E and its role in preventing or treating BPD.

What happens next?

Researchers are interested in studying individual types of vitamin E as dietary supplements to improve lung health and as a potential way to treat or prevent BPD. We will need more and better data from research studies to understand if taking certain vitamin E isoforms can help reduce the risk of:

BPD for newborns when taken by a pregnant women at risk of preterm birth.
BPD for premature newborn when given to the newborn right after birth.
Having long-term lung problems that may continue later into life.

Where can I learn more?

Access the full journal article titled, “Update on Vitamin E and Its Potential Role in Preventing or Treating Bronchopulmonary Dysplasia.”

The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

ePublished: March 7, 2018

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ECHO Study Suggests Specific Form of Vitamin E Prevents, Treats Bronchopulmonary Dysplasia