RESEARCH LETTER
Elevated blood pressure (BP) and hypertension in childhood are strongly related to hypertension in adulthood, a major risk factor for cardiovascular morbidity and mortality.1 Previous studies suggest that maternal tobacco smoking during pregnancy (MSDP) is associated with increased childhood BP, but findings are inconsistent and mostly limited to systolic BP and self-reported MSDP.2 This study examined the association of MSDP with childhood systolic and diastolic BP and hypertension using data from the Environmental influences on Child Health Outcomes (ECHO) Cohort. The study protocol was approved by the single ECHO institutional review board. Written informed consent, or child assent with parent’s/guardian’s permission, was obtained for participation in the ECHO Cohort Data and Biospecimen Collection Protocol. Select de-identified data are available through NICHD’s Data and Specimen Hub (DASH).3
We included children from singleton pregnancies with at least one BP measurement between 3–18 years and maternal self- or medical record report of any MSDP. We excluded cohorts with <10 children. We computed average systolic and diastolic BP Z-scores for each visit age adjusted for age, sex, and height.4 We utilized linear mixed models with random effects for individual participants nested within cohorts to test the association between MSDP and BP Z-scores, and Poisson regression models to test the association between MSDP and hypertension, defined as an average systolic and/or diastolic BP meeting or exceeding published thresholds [for children <13 y: ≥95th percentile, or ≥130/80 mm Hg (whichever is lower); for children ≥13y: ≥130/80] on ≥3 separate visits.1 We implemented unadjusted models and models adjusted for potential confounders identified previously (child race [parent report], maternal age at delivery, maternal pre-pregnancy BMI category, prenatal alcohol [self- or medical report], maternal education [highest level of school completed] as a proxy for socioeconomic status, and child sex [hypertension models only]). We also implemented models with additional adjustment for preterm birth (< 37 weeks). Sex- and age (< vs. ≥ 6 years)- stratified analyses were also performed. Models for MSDP and hypertension were fit with and without an interaction term between MSDP and child sex. Covariates with <20% missing data were imputed at the cohort type level using multivariate imputation by chained equations algorithm. We additionally examined associations with active smoking in a subset with maternal urine cotinine measured during the index pregnancy (no exposure: ≤1.6 ng/mL; active smoking: ≥75 ng/mL)5 and with secondhand smoke exposure based on the question “Did anyone (excluding the mother) ever smoke in the mother’s home(s) or dwelling(s) during the child’s pregnancy?” Only 20 subjects reported exposure to e-cigarettes in addition to traditional cigarettes.
A total of 13120 children born between 1999–2020 from 52 cohorts met study criteria, with 9.3% prevalence of MSDP and nearly equal prevalence of each sex (52% male). Most reported race as White (58%), but others reported Black (18%), multiple (10%), Asian (5%), or other races (5%). The majority of children (7034) had BP data from one age; 3139 had measures at two ages, and 2947 had measures at ≥3 ages. The mean child age across measurement visits was 6.17 years. In the subset of children with BP measures at ≥3 visits (n=4158), 240 (5.8%; females, 82; males, 158) met criteria for hypertension.1 In a subset of participants (n=2763; 10 cohorts), maternal urine cotinine was measured during pregnancy (median of 25 weeks gestation; range = 7–41), and we observed high concordance (>95%) between self-reported MSDP and pregnancy urine cotinine–derived categories.
Any MSDP was significantly associated with higher child diastolic BP (β=0.09 units; 95%CI: 0.04, 0.13; p<0.001) but not systolic BP (β=0.05 units; 95%CI: −0.01, 0.10; Figure 1). Any MSDP was also associated with a significant increase in the incidence rate ratio for hypertension (without interaction, 1.54; 95%CI: 1.04, 2.27). Cohort was removed from hypertension models to achieve convergence. Adding pre-term birth to models did not alter results (Figure 1). Results with sex-stratification or interaction suggest stronger effects among females compared to males (diastolic BP: females, 0.10; 95%CI: 0.03, 0.16; males, 0.08; 95%CI: 0.02, 0.15; hypertension interaction term, 0.31; 95%CI: 0.15, 0.66). Stratification at age 6 suggests weaker effect on diastolic BP in younger children (< 6 years, 0.07; 95%CI: 0.01, 0.13; ≥ 6years, 0.11; 95%CI: 0.06, 0.17), suggesting effects on BP may increase with age. Cotinine-determined active smoking exposure was associated with significantly higher diastolic and systolic BP Z-scores in crude models only and increased risk of hypertension before and after covariate adjustment. Secondhand smoke exposure only during pregnancy (1570 exposed vs 6017 unexposed) was not associated with increased BP Z-scores.
Figure 1. Summary of association of MSDP with childhood blood pressure (BP: both systolic [SBP] and diastolic [DBP]) or hypertension in the ECHO Cohort.
Effect sizes and 95% confidence intervals are shown on the x-axis (• unadjusted; ▲ adjusted for child race, maternal age at delivery, maternal pre-pregnancy BMI category, prenatal alcohol exposure, maternal education level, and child sex [hypertension models only]; ■ additionally adjusted for preterm birth). The top panel represents the effects of any MSDP ascertained via self-reported questionnaire or medical record in the total study population. The middle panel represents the effects of any MSDP in the subset of subjects with cotinine data. The bottom panel represents the effects of active smoking based on urine cotinine measured during the index pregnancy (no exposure: ≤1.6 ng/mL vs. active smoking: ≥75 ng/mL).
Findings from this large multicohort US study support previous evidence that MSDP is a risk factor for increased childhood BP and hypertension. Our results extend previous studies of the relationship between MSDP and childhood BP to a large US population of children that included both males and females, a younger age group, and use of an objective biomarker of exposure.2 Further, our results suggest that decreasing MSDP may reduce prevalence of hypertension in children and therefore among adults, improving overall health.
Acknowledgements
The authors wish to thank our ECHO Colleagues; the medical, nursing, and program staff; and the children and families participating in the ECHO cohort.
The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH. The sponsor, NIH, participated in the overall design and implementation of the ECHO Program, which was funded as a cooperative agreement between NIH and grant awardees. The sponsor approved the Steering Committee-developed ECHO protocol and its amendments including COVID-19 measures. The sponsor had no access to the central database, which was housed at the ECHO Data Analysis Center. Data management and site monitoring were performed by the ECHO Data Analysis Center and Coordinating Center. All analyses for scientific publication were performed by the study statistician, independently of the sponsor. The lead author wrote all drafts of the manuscript and made revisions based on co-authors and the ECHO Publication Committee (a subcommittee of the ECHO Operations Committee) feedback without input from the sponsor. The study sponsor did not review or approve the manuscript for submission to the journal.
Sources of Funding
Research reported in this publication was supported by the Environmental influences on Child Health Outcomes (ECHO) Program, Office of the Director, NIH, under Award Numbers U2COD023375 (Coordinating Center), U24OD023382 (Data Analysis Center), U24OD023319 with co-funding from the Office of Behavioral and Social Science Research (Measurement Core), U24OD035523 (Lab Core), ES0266542 (HHEAR), U24ES026539 (HHEAR Barbara O’Brien), U2CES026533 (HHEAR Lisa Peterson), U2CES026542 (HHEAR Patrick Parsons, Kannan Kurunthacalam), U2CES030859 (HHEAR Manish Arora), U2CES030857 (HHEAR Timothy R. Fennell, Susan J. Sumner, Xiuxia Du), U2CES026555 (HHEAR Susan L. Teitelbaum), U2CES026561 (HHEAR Robert O. Wright), U2CES030851 (HHEAR Heather M. Stapleton, P. Lee Ferguson), UG3/UH3OD023251 (Akram Alshawabkeh), UH3OD023320 and UG3OD035546 (Judy Aschner), UH3OD023332 (Clancy Blair, Leonardo Trasande), UG3/UH3OD023253 (Carlos Camargo), UG3/UH3OD023248 and UG3OD035526 (Dana Dabelea), UG3/UH3OD023313 (Daphne Koinis Mitchell), UH3OD023328 (Cristiane Duarte), UH3OD023318 (Anne Dunlop), UG3/UH3OD023279 (Amy Elliott), UG3/UH3OD023289 (Assiamira Ferrara), UG3/UH3OD023282 (James Gern), UH3OD023287 (Carrie Breton), UG3/UH3OD023365 (Irva Hertz-Picciotto), UG3/UH3OD023244 (Alison Hipwell), UG3/UH3OD023275 (Margaret Karagas), UH3OD023271 and UG3OD035528 (Catherine Karr), UH3OD023347 (Barry Lester), UG3/UH3OD023389 (Leslie Leve), UG3/UH3OD023344 (Debra MacKenzie), UH3OD023268 (Scott T.Weiss), UG3/UH3OD023288 (Cynthia McEvoy), UG3/UH3OD023342 (Kristen Lyall), UG3/UH3OD023349 (Thomas O’Connor), UH3OD023286 and UG3OD035533 (Emily Oken), UG3/UH3OD023348 (Mike O’Shea), UG3/UH3OD023285 (Jean Kerver), UG3/UH3OD023290 (Julie Herbstman), UG3/UH3OD023272 (Susan Schantz), UG3/UH3OD023249 (Joseph Stanford), UG3/UH3OD023305 (Leonardo Trasande), UG3/UH3OD023337 (Rosalind Wright), UG3OD035508 (Sheela Sathyanarayana), UG3OD035509 (Anne Marie Singh), UG3OD035513 and UG3OD035532 (Annemarie Stroustrup), UG3OD035516 and UG3OD035517 (Tina Hartert), UG3OD035518 (Jennifer Straughen), UG3OD035519 (Qi Zhao), UG3OD035521 (Katherine Rivera-Spoljaric), UG3OD035527 (Emily S Barrett), UG3OD035540 (Monique Marie Hedderson), UG3OD035543 (Kelly J Hunt), UG3OD035537 (Sunni L Mumford), UG3OD035529 (Hong-Ngoc Nguyen), UG3OD035542 (Hudson Santos), UG3OD035550 (Rebecca Schmidt), UG3OD035536 (Jonathan Slaughter), UG3OD035544 (Kristina Whitworth). Additional support from the Oregon Clinical Translational Research Institute funded by the National Center for Advancing Translational Sciences (UL1TR000128) and the Oregon National Primate Research Center (P51 OD011092).
Non-standard Abbreviations and Acronyms
- BP
blood pressure
- SBP
systolic blood pressure
- DBP
diastolic blood pressure
- MSDP
maternal tobacco smoking during pregnancy
- ECHO
Environmental influences on Child Health Outcomes
- BMI
body mass index
- DASH
Data and Specimen Hub
ECHO Collaborator Appendix
P Brian Smith
L Kristin Newby
Linda Adair
Lisa P. Jacobson
Diane Catellier
Monica McGrath
Christian Douglas
Priya Duggal
Emily Knapp
Amii Kress
Courtney K. Blackwell
Maxwell A. Mansolf
Jin-Shei Lai
Emily Ho
David Cella
Richard Gershon
Michelle L. Macy
Suman R. Das
Jane E. Freedman
Simon A. Mallal
John A. McLean
Ravi V. Shah
Meghan H. Shilts
Akram N. Alshawabkeh
Jose F. Cordero
John Meeker
Leonardo Trasande
Carlos A. Camargo
Kohei Hasegawa
Zhaozhong Zhu
Ashley F. Sullivan
Dana Dabelea
Wei Perng
Traci A. Bekelman
Greta Wilkening
Sheryl Magzamen
Brianna F. Moore
Anne P. Starling
Deborah J. Rinehart
Daphne Koinis Mitchell
Viren D’Sa
Sean C.L. Deoni
Hans-Georg Mueller
Cristiane S. Duarte
Catherine Monk
Glorisa Canino
Jonathan Posner
Tenneill Murray
Claudia Lugo-Candelas
Anne L. Dunlop
Patricia A. Brennan
Christine Hockett
Amy Elliott
Assiamira Ferrara
Lisa A. Croen
Monique M. Hedderson
John Ainsworth
Leonard B. Bacharier
Casper G. Bendixsen
James E. Gern
Diane R. Gold
Tina V. Hartert
Daniel J. Jackson
Christine C. Johnson
Christine L.M. Joseph
Meyer Kattan
Gurjit K. Khurana Hershey
Robert F. Lemanske, Jr.
Susan V. Lynch
Rachel L. Miller
George T. O’Connor
Carole Ober
Dennis Ownby
Katherine Rivera-Spoljaric
Patrick H. Ryan
Christine M. Seroogy
Anne Marie Singh
Robert A. Wood
Edward M. Zoratti
Rima Habre
Shohreh Farzan
Frank D. Gilliland
Irva Hertz-Picciotto
Deborah H. Bennett
Julie B. Schweitzer
Rebecca J. Schmidt
Janine M. LaSalle
Alison E. Hipwell
Catherine J. Karr
Nicole R. Bush
Kaja Z. LeWinn
Sheela Sathyanarayana
Qi Zhao
Frances Tylavsky
Kecia N. Carroll
Christine T. Loftus
Leslie D. Leve
Jody M. Ganiban
Jenae M. Neiderhiser
Scott T. Weiss
Augusto A. Litonjua
Cindy T. McEvoy
Eliot R. Spindel
Robert S. Tepper
Craig J. Newschaffer
Kristen Lyall
Heather E. Volk
Rebecca Landa
Sally Ozonoff
Joseph Piven
Heather Hazlett
Juhi Pandey
Robert Schultz
Steven Dager
Kelly Botteron
Daniel Messinger
Wendy Stone
Jennifer Ames
Thomas G. O’Connor
Richard K. Miller
Emily Oken
Michele R. Hacker
Tamarra James-Todd
T. Michael O’Shea
Rebecca C. Fry
Jean A. Frazier
Rachana Singh
Caitlin Rollins
Angela Montgomery
Ruben Vaidya
Robert M. Joseph
Lisa K. Washburn
Semsa Gogcu
Kelly Bear
Julie V. Rollins
Stephen R. Hooper
Genevieve Taylor
Wesley Jackson
Amanda Thompson
Julie Daniels
Michelle Hernandez
Kun Lu
Michael Msall
Madeleine Lenski
Rawad Obeid
Steven L. Pastyrnak
Elizabeth Jensen
Christina Sakai
Hudson Santos
Jean M. Kerver
Nigel Paneth
Charles J. Barone
Michael R. Elliott
Douglas M. Ruden
Chris Fussman
Julie B. Herbstman
Amy Margolis
Susan L. Schantz
Sarah Dee Geiger
Andrea Aguiar
Karen Tabb
Rita Strakovsky
Tracey Woodruff
Rachel Morello-Frosch
Amy Padula
Joseph B. Stanford
Christina A. Porucznik
Angelo P. Giardino
Rosalind J. Wright
Robert O. Wright
Brent Collett
Nicole Baumann-Blackmore
Ronald Gangnon
Daniel J. Jackson
Chris G. McKennan
Jo Wilson
Matt Altman
Judy L. Aschner
Annemarie Stroustrup
Stephanie L. Merhar
Paul E. Moore
Gloria S. Pryhuber
Mark Hudak
Ann Marie Reynolds Lyndaker
Andrea L. Lampland
Burton Rochelson
Sophia Jan
Matthew J. Blitz
Michelle W. Katzow
Zenobia Brown
Codruta Chiuzan
Timothy Rafael
Dawnette Lewis
Natalie Meirowitz
Brenda Poindexter
Tebeb Gebretsadik
Sarah Osmundson
Jennifer K. Straughen
Amy Eapen
Andrea Cassidy-Bushrow
Ganesa Wegienka
Alex Sitarik
Kim Woodcroft
Audrey Urquhart
Albert Levin
Tisa Johnson-Hooper
Brent Davidson
Tengfei Ma
Emily S. Barrett
Martin J. Blaser
Maria Gloria Dominguez-Bello
Daniel B. Horton
Manuel Jimenez
Todd Rosen
Kristy Palomares
Lyndsay A. Avalos
Yeyi Zhu
Kelly J. Hunt
Roger B. Newman
Michael S. Bloom
Mallory H. Alkis
James R. Roberts
Sunni L. Mumford
Heather H. Burris
Sara B. DeMauro
Lynn M. Yee
Aaron Hamvas
Antonia F. Olidipo
Andrew S. Haddad
Lisa R. Eiland
Nicole T. Spillane
Kirin N. Suri
Stephanie A. Fisher
Jeffrey A. Goldstein
Leena B. Mithal
Raye-Ann O. DeRegnier
Nathalie L. Maitre
Ruby H.N. Nguyen
Meghan M. JaKa
Abbey C. Sidebottom
Michael J. Paidas
JoNell E. Potter
Natale Ruby
Lunthita Duthely
Arumugam Jayakumar
Karen Young
Isabel Maldonado
Meghan Miller
Jonathan L. Slaughter
Sarah A. Keim
Courtney D. Lynch
Kartik K. Venkatesh
Kristina W.Whitworth
Elaine Symanski
Thomas F. Northrup
Hector Mendez-Figueroa
Ricardo A. Mosquera
Margaret R.Karagas
Juliette C. Madan
Debra M. MacKenzie
Johnnye L. Lewis
Brandon J. Rennie
Bennett L. Leventhal
Young Shin Kim
Somer Bishop
Sara S. Nozadi
Li Luo
Barry M. Lester
Carmen J. Marsit
Todd Everson
Cynthia M. Loncar
Elisabeth C. McGowan
Stephen J. Sheinkopf
Brian S. Carter
Jennifer Check
Jennifer B. Helderman
Charles R. Neal
Lynne M. Smith
Footnotes
Disclosures: Dr. Ladd-Acosta reports consulting fees from the University of Iowa for providing expertise on autism epigenetics, outside the scope of this work. Dr. Weiss reports honoraria from UpToDate and is on the Board of Histolix, a digital pathology company. All other co-authors declare that they have no competing interests.
Contributor Information
Lyndsey E. Shorey-Kendrick, Division of Neuroscience, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR..
Christine Ladd-Acosta, Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD..
Haozuo Zhao, Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD..
Judy L. Aschner, Center for Discovery and Innovation, Hackensack Meridian School of Medicine, Nutley, NJ..
Carrie V. Breton, Department of Population and Public Health Sciences, Keck School of Medicine, University of Southern California, Los Angeles, CA..
Carlos A. Camargo, Jr., Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA..
Andrea E. Cassidy-Bushrow, Department of Public Health Sciences, Henry Ford Hospital, Detroit, MI.; Department of Pediatrics and Human Development, College of Human Medicine, Michigan State University, East Lansing, MI.
Elena Colicino, Department of Environmental Medicine and Climate Science, Icahn School of Medicine at Mount Sinai, New York, NY..
Dana Dabelea, Lifecourse Epidemiology of Adiposity and Diabetes (LEAD) Center, University of Colorado Anschutz Medical Campus, Aurora, CO..
Anne L. Dunlop, Department of Gynecology and Obstetrics, Emory University School of Medicine, Atlanta, GA..
Shohreh F. Farzan, Department of Population and Public Health Sciences, Keck School of Medicine, University of Southern California, Los Angeles, CA..
Assiamira Ferrara, Upstream Prevention of Adiposity and Diabetes Mellitus (UPSTREAM) Center, Division of Research, Kaiser Permanente Northern California, Oakland, CA..
James E. Gern, Department of Pediatrics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI..
Irva Hertz-Picciotto, Department of Public Health Sciences, School of Medicine, University of California Davis, Davis, CA..
Margaret R. Karagas, Department of Epidemiology, Geisel School of Medicine, Dartmouth College, Hanover, NH..
Catherine J. Karr, Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA.
Barry Lester, Department of Pediatrics, Women & Infants Hospital, Brown University, Providence, RI.; Brown Center for the Study of Children at Risk, Warren Alpert Medical School of Brown University, Women & Infants Hospital, Providence, RI. Department of Psychiatry and Human Behavior, Warren Alpert Medical School of Brown University, Providence, RI.
Leslie D. Leve, Prevention Science Institute, University of Oregon, Eugene, OR..
Brianna F. Moore, Lifecourse Epidemiology of Adiposity and Diabetes (LEAD) Center, University of Colorado Anschutz Medical Campus, Aurora, CO..
Jenae M. Neiderhiser, Department of Psychology, Penn State University, University Park, PA..
Emily Oken, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA..
T. Michael O’Shea, Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, NC..
Keia Sanderson, Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, NC..
Joseph B. Stanford, Department of Family and Preventive Medicine, Spencer Fox Eccles School of Medicine, University of Utah, Salt Lake City, UT..
Leonardo Trasande, Department of Pediatrics, New York University Grossman School of Medicine, New York, NY..
Scott T. Weiss, Channing Division of Network Medicine, Department of Medicine Brigham and Women’s Hospital and Harvard Medical School, Boston, MA..
Rosalind J. Wright, Department of Public Health, Icahn School of Medicine at Mount Sinai, New York, NY..
Qi Zhao, Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis, TN..
Yeyi Zhu, Division of Research, Kaiser Permanente Northern California, Pleasanton, CA..
Cindy T. McEvoy, Department of Pediatrics, Oregon Health & Science University, Portland, OR..
Eliot R. Spindel, Division of Neuroscience, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR..
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