• Publications
  • Influence
A new and improved population-based Canadian reference for birth weight for gestational age.
BACKGROUND Existing fetal growth references all suffer from 1 or more major methodologic problems, including errors in reported gestational age, biologically implausible birth weight for gestationalExpand
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Breastfeeding and child cognitive development: new evidence from a large randomized trial.
CONTEXT The evidence that breastfeeding improves cognitive development is based almost entirely on observational studies and is thus prone to confounding by subtle behavioral differences in theExpand
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Reducing bias through directed acyclic graphs
  • I. Shrier, R. Platt
  • Computer Science, Medicine
  • BMC medical research methodology
  • 30 October 2008
We show that including a different subset of covariates in the statistical model can introduce a conditional association or bias (called "collider-stratification bias" or "selection bias" by different authors). Expand
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Effects of prolonged and exclusive breastfeeding on child height, weight, adiposity, and blood pressure at age 6.5 y: evidence from a large randomized trial.
BACKGROUND The evidence that breastfeeding protects against obesity and a variety of chronic diseases comes almost entirely from observational studies, which have a potential for bias due toExpand
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Stress pathways to spontaneous preterm birth: the role of stressors, psychological distress, and stress hormones.
The authors investigated a large number of stressors and measures of psychological distress in a multicenter, prospective cohort study of spontaneous preterm birth among 5,337 Montreal (Canada)-areaExpand
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Overadjustment Bias and Unnecessary Adjustment in Epidemiologic Studies
Overadjustment is defined inconsistently. This term is meant to describe control (eg, by regression adjustment, stratification, or restriction) for a variable that either increases net bias orExpand
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Why are babies getting bigger? Temporal trends in fetal growth and its determinants.
OBJECTIVES To describe temporal trends in fetal "growth" and to examine the roles of sociodemographic, anthropometric, and other determinants. STUDY DESIGN Hospital-based cohort study of 61,437Expand
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Delirium in Older Emergency Department Patients Discharged Home: Effect on Survival
OBJECTIVES: To determine whether prevalent delirium is an independent predictor of mortality in older patients seen in emergency departments (EDs) and discharged home without admission.
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Infant growth and health outcomes associated with 3 compared with 6 mo of exclusive breastfeeding.
BACKGROUND Opinions and recommendations about the optimal duration of exclusive breastfeeding have been strongly divided, but few published studies have provided direct evidence on the relative risksExpand
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Should meta-analyses of interventions include observational studies in addition to randomized controlled trials? A critical examination of underlying principles.
Some authors argue that systematic reviews and meta-analyses of intervention studies should include only randomized controlled trials because the randomized controlled trial is a more valid studyExpand
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