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The Navigation Guide—Evidence-Based Medicine Meets Environmental Health: Systematic Review of Human Evidence for PFOA Effects on Fetal Growth
Open accessAbstract
Background: The Navigation Guide methodology was developed to meet the need for a robust method of systematic and transparent research synthesis in environmental health science. We conducted a case study systematic review to support proof of concept of the method. Objective: We applied the Navigation Guide systematic review methodology to determine whether developmental exposure to perfluorooctanoic acid (PFOA) affects fetal growth in humans. Methods: We applied the first 3 steps of the Navigation Guide methodology to human epidemiological data: 1) specify the study question, 2) select the evidence, and 3) rate the quality and strength of the evidence. We developed a protocol, conducted a comprehensive search of the literature, and identified relevant studies using prespecified criteria. We evaluated each study for risk of bias and conducted meta-analyses on a subset of studies. We rated quality and strength of the entire body of human evidence. Results: We identified 18 human studies that met our inclusion criteria, and 9 of these were combined through meta-analysis. Through meta-analysis, we estimated that a 1-ng/mL increase in serum or plasma PFOA was associated with a –18.9 g (95% CI: –29.8, –7.9) difference in birth weight. We concluded that the risk of bias across studies was low, and we assigned a “moderate” quality rating to the overall body of human evidence. Conclusion: On the basis of this first application of the Navigation Guide systematic review methodology, we concluded that there is “sufficient” human evidence that developmental exposure to PFOA reduces fetal growth. Citation: Johnson PI, Sutton P, Atchley DS, Koustas E, Lam J, Sen S, Robinson KA, Axelrad DA, Woodruff TJ. 2014. The Navigation Guide—evidence-based medicine meets environmental health: systematic review of human evidence for PFOA effects on fetal growth. Environ Health Perspect 122:1028–1039; http://dx.doi.org/10.1289/ehp.1307893
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“such methods have only recently been developed and utilized in environmental health sciences [23–30].”
From A Systematic Review and Meta-Analysis of Multiple Airborne Pollutants and Autism Spectrum Disorder (2016) · cites this paper as [30]
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“This observation is consistent with our previous systematic reviews, [24, 27, 28, 30]”
From A Systematic Review and Meta-Analysis of Multiple Airborne Pollutants and Autism Spectrum Disorder (2016) · cites this paper as [30]
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Patwary, M. M., Bardhan, M., Browning, M. H. E. M., Astell‐Burt, T., van den Bosch, M. A., Dong, J., Dzhambov, A. M., Dadvand, P., Fasolino, T. K., Markevych, I., et al. (2023) · The Science of The Total Environment · doi:10.1016/j.scitotenv.2023.169635 · Cited by 24
“Downgrades considered the risk of bias, indirectness, inconsistency, imprecision, and publication bias (Johnson et al. , 2014).”
BackgroundPeterson, A. K., Eckel, S. P., Habre, R., Yang, T., Faham, D., Farzan, S. F., Grubbs, B. H., Kannan, K., Robinson, M., Lerner, D. L., et al. (2022) · Frontiers in Epidemiology · doi:10.3389/fepid.2022.934715 · Cited by 23
Environmental contaminants and child’s growth
Kadawathagedara, M., de Lauzon‐Guillain, B., & Botton, J. (2018) · Journal of Developmental Origins of Health and Disease · doi:10.1017/s2040174418000995 · Cited by 30
Using systematic review in occupational safety and health
Howard, J., Piacentino, J. D., MacMahon, K. L., & Schulte, P. A. (2017) · American Journal of Industrial Medicine · doi:10.1002/ajim.22771 · Cited by 19
Xu, L., Li, Y., Chen, L., Wang, S., Ding, X., Zhu, P., & Jiao, J. (2024) · Environmental Pollution · doi:10.1016/j.envpol.2024.124943 · Cited by 16
Luque-García, L., Muxika-Legorburu, J., Mendia-Berasategui, O., Lertxundi, A., García‐Baquero, G., & Ibarluzea, J. M. (2023) · Environmental Research · doi:10.1016/j.envres.2023.118059 · Cited by 18
Ellis, L. B., Molina, K., Robbins, C., Freisthler, M. S., Sgargi, D., Mandrioli, D., & Perry, M. J. (2023) · Environmental Health Perspectives · doi:10.1289/ehp12678 · Cited by 20
“The Navigation Guide strength of evidence de fi nitions 38,39,43 (Table S11) are based on categories used by the International Agency for Research on Cancer, 96 the U.S. Preventive Services Task Force, 97 and U.S. Environmental Protection Agency 98,99 and re fl ect the level of certainty in the…”
BackgroundMethodInfluentialInfant formula and baby food as a source of perfluoroalkyl substances for infants
Mikołajczyk, S., Warenik-Bany, M., & Pajurek, M. (2022) · Environmental Pollution · doi:10.1016/j.envpol.2022.120810 · Cited by 16
Menegatto, M., Lezzi, S., Musolino, M., & Zamperini, A. (2022) · International Journal of Environmental Research and Public Health · doi:10.3390/ijerph192214761 · Cited by 21
“In fact, as evidenced by research [36,52], PFAS accumulated in the mother’s body can be transmitted to the unborn child through the placenta and during lactation.”
BackgroundKim, H. Y., Kim, K., Shin, C. H., Lim, Y.-H., Kim, J. I., Kim, B.-N., Hong, Y., & Lee, Y. A. (2020) · Thyroid · doi:10.1089/thy.2019.0436 · Cited by 21
“S2), both PFAS concentrations (exposure) (19,20) and thyroid function (outcome) can affect BMI (21), and BMI can be considered as a collider rather than a confounder; adjustment for BMI could therefore bias the models (22).”
Pinney, S. M., Windham, G. C., Xie, C., Herrick, R., Calafat, A. M., McWhorter, K. L., Fassler, C. S., Hiatt, R. A., Kushi, L. H., & Biro, F. M. (2019) · International Journal of Hygiene and Environmental Health · doi:10.1016/j.ijheh.2019.07.002 · Cited by 28
Marí-Bauset, S., Donat‐Vargas, C., González, A. L., Marí-Sanchis, A., Peraita‐Costa, I., Llopis-Morales, J., & Morales‐Suárez‐Varela, M. (2018) · Children · doi:10.3390/children5120157 · Cited by 17
Choi, J., Kim, J., & Lee, H. (2022) · International Journal of Environmental Research and Public Health · doi:10.3390/ijerph191811318 · Cited by 20
Kowald, C., Brorman, E., Shankar, S., Klemashevich, C. L., Staack, D., & Pillai, S. D. (2020) · Radiation Physics and Chemistry · doi:10.1016/j.radphyschem.2020.109323 · Cited by 22
Gennings, C., Wolk, A., Håkansson, N., Lindh, C. H., & Bornehag, C.-G. (2020) · BMJ Nutrition, Prevention & Health · doi:10.1136/bmjnph-2020-000099 · Cited by 15
Marks, K. J., Jeddy, Z., Flanders, W. D., Northstone, K., Fraser, A., Calafat, A. M., Kato, K., & Hartman, T. J. (2019) · Reproductive Toxicology · doi:10.1016/j.reprotox.2019.08.003 · Cited by 19
Avanasi, R., Shin, H.-M., Vieira, V., & Bartell, S. (2016) · Environmental Research · doi:10.1016/j.envres.2016.01.011 · Cited by 15
“…the validity of this study has been questioned by one group of researchers who excluded it from a meta-analysis of PFOA exposure and fetal growth due to the retrospectively modeled exposure assignments with limited validation by measured biomarkers (Johnson and Sutton, 2014; Koustas et al., 2014).”
Hansmeier, N., Chao, T., Herbstman, J. B., Goldman, L. R., Witter, F. R., & Halden, R. U. (2014) · Journal of Proteome Research · doi:10.1021/pr500990w · Cited by 17
Li, M., Xu, C.-K., Li, L.-W., Gao, F., Xu, C., Yu, Y., Huang, C., Liu, Y.-N., Shen, X., & Hu, J.-Y. (2025) · Environmental Science and Technology · doi:10.1021/acs.est.5c07230 · Cited by 14
Jang, H., Calder, L., Choi, J. W., Kwon, B., Pearce, E. N., & Shin, H. (2024) · Chemosphere · doi:10.1016/j.chemosphere.2025.144098 · Cited by 16
Kinkade, C. W., Rivera‐Núñez, Z., Thurston, S. W., Kannan, K., Miller, R. K., Brunner, J., Wong, E., Groth, S. W., O’Connor, T. G., & Barrett, E. S. (2023) · Environmental Health · doi:10.1186/s12940-023-01009-3 · Cited by 16
“Systematic reviews evaluating human and animal studies have concluded that maternal serum PFOA is associated with lower birthweight [57–59] with some evidence suggesting that PFAS exposure may lead to lower birthweight via disruption of the placenta [60].”
BackgroundBach, C. C., Liew, Z., Matthiesen, N. B., Henriksen, T. B., Bech, B. H., Nohr, E. A., Bonefeld‐Jørgensen, E. C., & Olsen, J. (2022) · Environmental Research · doi:10.1016/j.envres.2022.113262 · Cited by 17
Prenatal exposure to perfluoroalkyl substances and adipocytokines: the HOME Study
Buck, C. O., Eliot, M., Kelsey, K. T., Calafat, A. M., Chen, A., Ehrlich, S. R., Lanphear, B. P., & Braun, J. M. (2018) · Pediatric Research · doi:10.1038/s41390-018-0170-1 · Cited by 16
“Despite this, epidemiologic and toxicological evidence suggests that gestational perfluoroalkyl substances exposure is associated with impaired fetal growth.(6,7) While we did not find evidence that neonatal adipocytokine concentrations, markers of fetal growth, were associated with perfluoroalkyl substances serum con…”
BackgroundLaKind, J. S., Anthony, L. G., & Goodman, M. G. (2017) · Journal of Toxicology and Environmental Health Part B · doi:10.1080/10937404.2017.1370847 · Cited by 15
“Other instruments were developed to guide systematic reviews and meta-analyses of observational research (Stroup et al. 2000) and, more specifically, assessments of the environmental epidemiologic studies (Johnson et al. 2014; LaKind et al. 2014a; Morgan et al. 2016; Youngstrom et al. 2011).”
BackgroundMethodGillespie, L., Martin, J. H., Anderson, A. L., Bernstein, I. R., Stanger, S. J., Trigg, N. A., Schjenken, J. E., Gannon, A., Parameswaran, S., Smyth, S. P., et al. (2025) · Communications Biology · doi:10.1038/s42003-025-08865-4 · Cited by 14
“…in 4-cell embryos fertilized by these sperm identi fi ed the activation of disease functions relating to several cancers, “ size of body ” , “ disorder of lipid metabolism ” , and “ growth failure ” in the low PFAS group, all of which have been linked to PFAS exposure in humanstudies 18,63,64 .”
O’Donnell, C., Campbell, E. J., McCormick, S., & Anenberg, S. C. (2024) · Environmental Health · doi:10.1186/s12940-024-01116-9 · Cited by 14
“We compared the results of the strength of evidence rating to definitions specified in the Johnson et al. [31] Navigation Guide for “sufficient evidence of toxicity,” “limited evidence of toxicity,” “inad-equate evidence of toxicity,” or “evidence of lack of toxic-ity” (Table S5).”
MethodResultInfluentialZell-Baran, L. M., Dabelea, D., Norris, J. M., Glueck, D. H., Adgate, J. L., Brown, J. M., Harrall, K. K., Calafat, A. M., & Starling, A. P. (2023) · Environmental Health Perspectives · doi:10.1289/ehp12863 · Cited by 13
Lazarevic, N., Barnett, A., Sly, P., Callan, A. C., Stasinska, A., Heyworth, J., Hinwood, A., & Knibbs, L. (2020) · International Journal of Hygiene and Environmental Health · doi:10.1289/isee.2020.virtual.p-0316 · Cited by 13
Sgargi, D., Ádám, B., Budnik, L. T., Dinelli, G., Moldovan, H. R., Perry, M. J., Scheepers, P. T. J., Schlünssen, V., Teixeira, J. P., Mandrioli, D., et al. (2020) · Environmental Research · doi:10.1016/j.envres.2020.109470 · Cited by 22
“…(PRISMA) (Moher et al., 2015; Shamseer et al., 2015; Beller et al., 2013Liberati et al., 2009), the Navigation Guide (Woodruff and Sutton, 2014; Koustas et al., 2014), the Cochrane Collaboration Higgins and Green, 2011( and the WHO/ILO joint methodology for systematic reviews (Mandrioli et…”
MethodDescatha, A., Sembajwe, G. N., Baer, M., Boccuni, F., Tecco, C. D., Duret, C., Evanoff, B., Gagliardi, D., Ivanov, I. D., Leppink, N., et al. (2018) · Environment International · doi:10.1016/j.envint.2018.06.016 · Cited by 52
Shurson, G. C. (2025) · Sustainability · doi:10.3390/su17156957 · Cited by 12
Bottini, I., Vecchi, S., Sario, M. D., Bauleo, L., Trentalange, A., Michelozzi, P., & Ancona, C. (2025) · BMC Public Health · doi:10.1186/s12889-025-23150-z · Cited by 18
“Following the guidelines provided by the Navigation Guide, which are based on the sufficiency or insufficiency of information regarding the presence or absence of specific biases, each domain was rated as "high", "probably high", as, "low" or "probably low" risk of bias [27].”
InfluentialHong, S., Kang, B. S., Kim, O., Won, S., Kim, H. S., Wie, J., Shin, J., Choi, S., Yun, S.-J., Kim, Y. H., et al. (2024) · Frontiers in Public Health · doi:10.3389/fpubh.2024.1351786 · Cited by 12
Yim, G., McGee, G., Gallagher, L. G., Baker, E., Jackson, B. P., Calafat, A. M., Botelho, J. C., Gilbert‐Diamond, D., Karagas, M. R., Romano, M. E., et al. (2023) · Chemosphere · doi:10.1016/j.chemosphere.2023.138644 · Cited by 13
Damtew, Y. T., Tong, M., Varghese, B., Hansen, A., Liu, J.-W., Dear, K., Zhang, Y., Morgan, G. G., Driscoll, T. G., Capon, T., et al. (2022) · Acta Tropica · doi:10.1016/j.actatropica.2022.106454 · Cited by 12
Reviews in environmental health: How systematic are they?
Sutton, P., Chartres, N., Rayasam, S. D. G., Daniels, N., Lam, J., Maghrbi, E., & Woodruff, T. J. (2021) · Environment International · doi:10.1016/j.envint.2021.106473 · Cited by 19
Self-citation
Metadata
- Authors
- Johnson, P. I., Sutton, P., Atchley, D. S., Koustas, E., Lam, J., Sen, S., Robinson, K. A., Axelrad, D. A., & Woodruff, T. J.
- Affiliations
- University of California, San Francisco (US)
- Environmental Protection Agency (US)
- Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California, USA
- Johns Hopkins University (US)
- Corresponding author
- Johnson, Paula I.
- Venue
- Environmental Health Perspectives
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-06-25
- Volume
- 122
- Issue
- 10
- Pages
- 1028-1039
- ISSN
- 0091-6765 (ISSN-L)
- 1552-9924
- PMC
- PMC4181929
- OpenAlex
- W4243002209
- Cited by
- 449
- References
- 131
- Citations by year
- 2026: 29 · 2025: 31 · 2024: 36 · 2023: 43 · 2022: 32 · 2021: 50 · 2020: 68 · 2019: 34 · 2018: 31 · 2017: 42 · 2016: 25 · 2015: 20 · 2014: 8
- FWCI
- 2.88
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- public-domain
- creativecommons.org/licenses/by/4.0/ (vor, 1283 d)
- Locations
- Environmental Health Perspectives (publishedVersion, public-domain)
- PubMed Central (publishedVersion, public-domain)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- U.S. Department of Energy
- U.S. Environmental Protection Agency (RD-83543301)
- New York Community Trust
- Heinz Endowments
- Johnson Family Foundation
- Rose Foundation for Communities and the Environment
- Kaiser Permanente
- Office of Research and Development
- Oak Ridge Institute for Science and Education
- University of California, San Francisco
- National Center For Environmental Assessment
- National Institute of Environmental Health Sciences (ES018135, P01ES022841, ES022841, P20ES018135)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Health, Environment, Cognitive Aging
- Keywords
- perfluorooctanoic acid, fetal growth, birth weight, early life exposure, environmental health, risk of bias, perfluorinated compounds
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