Evidence map›Paper›PMID 26553860›Full record

ArticleCMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne2016

Comparison of black-white disparities in preterm birth between Canada and the United States.

Britt McKinnon, Seungmi Yang, Michael S Kramer, Tracey Bushnik, Amanda J Sheppard, Jay S Kaufman

Open access · goldAbstract readComparative Study
In one paragraph

Article in CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 42 papers.

0numbers the graph read from it
0cells of the map it votes in
42citing papers in PubMed
2.4field-weighted citation impact, top 11% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

42 citing papers in PubMed, 83 citations in OpenAlex.

  1. Racial inequities in severe maternal morbidity among Black and White people in Canada: a population-based cohort study, 2012 to 2023.CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2026
    Article
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  4. Maternal and neonatal health in Canada's Black communities: A scoping review of epidemiologic studies.Canadian journal of public health = Revue canadienne de sante publique · 2026
    Article
  5. Article
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  7. Pediatric Morbidity Among Black Haitians in Canada: A Longitudinal Cohort Study.Journal of racial and ethnic health disparities · 2025
    Article
  8. Article
  9. Stress-induced developmental plasticity and spontaneous preterm birth: A justice-oriented eco-evo-devo review.European journal of obstetrics & gynecology and reproductive biology: X · 2025
    Review
  10. Article
  11. CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2024
    Article
  12. Article
  13. Achieving equity in reproductive care and birth outcomes for Black people in Canada.CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2024
    Article
  14. Article
  15. Article
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  17. New Hypertension After Pregnancy in Patients With Heart Disease.Journal of the American Heart Association · 2023
    Article
  18. Article
  19. Article
  20. Health in colour: black women, racism, and maternal health.Lancet regional health. Americas · 2023
    Review
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

6 authors at 1 institution in 1 country.

Britt McKinnonDepartment of Epidemiology, Biostatistics and Occupational Health (McKinnon, Yang, Kramer, Kaufman), McGill University Faculty of Medicine, Montréal, Que.; Institute for Health and Social Policy (McKinnon, Kaufman), McGill University, Montréal, Que.; Department of Pediatrics (Kramer), McGill University Faculty of Medicine, Montréal, Que.; Health Analysis Division (Bushnik), Statistics Canada, Ottawa, Ont.; AboutKidsHealth (Sheppard), The Hospital for Sick Children, Toronto, Ont.; Dalla Lana School of Public Health (Sheppard), University of Toronto, Toronto, Ont. britt.mckinnon@mcgill.ca.
Seungmi YangDepartment of Epidemiology, Biostatistics and Occupational Health (McKinnon, Yang, Kramer, Kaufman), McGill University Faculty of Medicine, Montréal, Que.; Institute for Health and Social Policy (McKinnon, Kaufman), McGill University, Montréal, Que.; Department of Pediatrics (Kramer), McGill University Faculty of Medicine, Montréal, Que.; Health Analysis Division (Bushnik), Statistics Canada, Ottawa, Ont.; AboutKidsHealth (Sheppard), The Hospital for Sick Children, Toronto, Ont.; Dalla Lana School of Public Health (Sheppard), University of Toronto, Toronto, Ont.
Michael S KramerDepartment of Epidemiology, Biostatistics and Occupational Health (McKinnon, Yang, Kramer, Kaufman), McGill University Faculty of Medicine, Montréal, Que.; Institute for Health and Social Policy (McKinnon, Kaufman), McGill University, Montréal, Que.; Department of Pediatrics (Kramer), McGill University Faculty of Medicine, Montréal, Que.; Health Analysis Division (Bushnik), Statistics Canada, Ottawa, Ont.; AboutKidsHealth (Sheppard), The Hospital for Sick Children, Toronto, Ont.; Dalla Lana School of Public Health (Sheppard), University of Toronto, Toronto, Ont.
Tracey BushnikDepartment of Epidemiology, Biostatistics and Occupational Health (McKinnon, Yang, Kramer, Kaufman), McGill University Faculty of Medicine, Montréal, Que.; Institute for Health and Social Policy (McKinnon, Kaufman), McGill University, Montréal, Que.; Department of Pediatrics (Kramer), McGill University Faculty of Medicine, Montréal, Que.; Health Analysis Division (Bushnik), Statistics Canada, Ottawa, Ont.; AboutKidsHealth (Sheppard), The Hospital for Sick Children, Toronto, Ont.; Dalla Lana School of Public Health (Sheppard), University of Toronto, Toronto, Ont.
Amanda J SheppardDepartment of Epidemiology, Biostatistics and Occupational Health (McKinnon, Yang, Kramer, Kaufman), McGill University Faculty of Medicine, Montréal, Que.; Institute for Health and Social Policy (McKinnon, Kaufman), McGill University, Montréal, Que.; Department of Pediatrics (Kramer), McGill University Faculty of Medicine, Montréal, Que.; Health Analysis Division (Bushnik), Statistics Canada, Ottawa, Ont.; AboutKidsHealth (Sheppard), The Hospital for Sick Children, Toronto, Ont.; Dalla Lana School of Public Health (Sheppard), University of Toronto, Toronto, Ont.
Jay S KaufmanDepartment of Epidemiology, Biostatistics and Occupational Health (McKinnon, Yang, Kramer, Kaufman), McGill University Faculty of Medicine, Montréal, Que.; Institute for Health and Social Policy (McKinnon, Kaufman), McGill University, Montréal, Que.; Department of Pediatrics (Kramer), McGill University Faculty of Medicine, Montréal, Que.; Health Analysis Division (Bushnik), Statistics Canada, Ottawa, Ont.; AboutKidsHealth (Sheppard), The Hospital for Sick Children, Toronto, Ont.; Dalla Lana School of Public Health (Sheppard), University of Toronto, Toronto, Ont.
Statistics Canada · CA

Funding

Canadian Institutes of Health Research MOP-111122
6 · The paper itself

Abstract

backgroundA higher risk of preterm birth among black women than among white women is well established in the United States. We compared differences in preterm birth between non-Hispanic black and white women in Canada and the US, hypothesizing that disparities would be less extreme in Canada given the different historical experiences of black populations and Canada's universal health care system.

methodsUsing data on singleton live births in Canada and the US for 2004-2006, we estimated crude and adjusted risk ratios and risk differences in preterm birth (< 37 wk) and very preterm birth (< 32 wk) among non-Hispanic black versus non-Hispanic white women in each country. Adjusted models for the US were standardized to the covariate distribution of the Canadian cohort.

resultsIn Canada, 8.9% and 5.9% of infants born to black and white mothers, respectively, were preterm; the corresponding figures in the US were 12.7% and 8.0%. Crude risk ratios for preterm birth among black women relative to white women were 1.49 (95% confidence interval [CI] 1.32 to 1.66) in Canada and 1.57 (95% CI 1.56 to 1.58) in the US (p value for heterogeneity [pH] = 0.3). The crude risk differences for preterm birth were 2.94 (95% CI 1.91 to 3.96) in Canada and 4.63 (95% CI 4.56 to 4.70) in the US (pH = 0.003). Adjusted risk ratios for preterm birth (pH = 0.1) were slightly higher in Canada than in the US, whereas adjusted risk differences were similar in both countries. Similar patterns were observed for racial disparities in very preterm birth.

interpretationRelative disparities in preterm birth and very preterm birth between non-Hispanic black and white women were similar in magnitude in Canada and the US. Absolute disparities were smaller in Canada, which reflects a lower overall risk of preterm birth in Canada than in the US in both black and white populations.

Indexed as

Black PeopleWhite PeopleAdultBlack or African AmericanCanadaFemaleHumansInfant, NewbornMaleOdds RatioPregnancyPremature BirthUnited StatesYoung Adult

Identifiers

PMID26553860
PMCPMC4695373
OpenAlexW2177218638

What OpenQuestion holds

Textmetadata
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.