Skip to main content

Publication Results (225)

See all results
  • Neonatal opioid withdrawal and antenatal opioid prescribing

    Turner SD, Gomes T, Camacho X, Yao Z, Guttmann A, Mamdani MM, Juurlink DN, Dhalla IR. CMAJ Open. 2015; 3(1):E55-61. Epub 2015 Feb 11.

  • Effect of human papillomavirus (HPV) vaccination on clinical indicators of sexual behaviour among adolescent girls: the Ontario Grade 8 HPV Vaccine Cohort Study

    Smith LM, Kaufman JS, Strumpf EC, Lévesque LE. CMAJ. 2015; 187(2):E74-81. Epub 2014 Dec 8.

  • Ambient air pollution and incidence of early-onset paediatric type 1 diabetes: a retrospective population-based cohort study

    Elten M, Donelle J, Lima I, Burnett RT, Weichenthal S, Stieb DM, Hystad P, van Donkelaar A, Chen H, Paul LA, Crighton E, Martin RV, Decou ML, Luo W, Lavigne É. Environ Res. 2020; 184:109291. Epub 2020 Feb 22. DOI:

  • Maternal schizophrenia and adverse birth outcomes: What mediates the risk?

    Vigod SN, Fung K, Amartey A, Bartsch E, Felemban R, Saunders N, Guttmann A, Chiu M, Barker LC, Kurdyak P, Brown HK. Soc Psychiatry Psychiatr Epidemiol. 2020; 55(5):561-70. Epub 2019 Dec 6. DOI:

  • Infant and maternal outcomes for women who experience imprisonment in Ontario Canada: a retrospective cohort study

    Carter Ramirez A, Liauw J, Costescu D, Holder L, Lu H, Kouyoumdjian FG. J Obstet Gynaecol Can. 2020; 42(4):462-72.e2. Epub 2020 Jan 13. DOI:

  • Ambient air pollution and the risk of pediatric-onset inflammatory bowel disease: a population-based cohort study

    Elten M, Benchimol EI, Fell DB, Kuenzig ME, Smith G, Chen H, Kaplan GG, Lavigne E. Environ Int. 2020; 138:105676. Epub 2020 Mar 24. DOI:

  • Outcomes of pregnant women with cirrhosis and their infants in a population-based study

    Flemming JA, Mullin M, Lu J, Sarkar MA, Djerboua M, Velez MP, Brogly S, Terrault NA. Gastroenterology. 2020; 159(5):1752-62.e10. Epub 2020 Aug 8. DOI:

  • BMI and risk of gestational diabetes among women of South Asian and Chinese ethnicity: a population-based study

    Read SH, Rosella LC, Berger H, Feig DS, Fleming K, Ray JG, Shah BR, Lipscombe LL. Diabetologia. 2021; 64(4):805-13. Epub 2021 Jan 24. DOI:

  • Abortion safety and use with normally prescribed mifepristone in Canada

    Schummers L, Darling EK, Dunn S, McGrail K, Gayowsky A, Law MR, Laba T, Kaczorowski J, Norman WV. N Engl J Med. 2022; 386(1):57-67. Epub 2021 Dec 8. DOI:

  • A more accurate approach to define abortion cohorts using linked administrative data: an application to Ontario, Canada

    Schummers L, McGrail K, Darling EK, Dunn S, Gayowsky A, Kaczorowski J, Norman WV. Int J Popul Data Sci. 2022; 7(1):1700. Epub 2022 Apr 29. DOI:

  • The prognostic value of the oral glucose tolerance test for future type-2 diabetes in nulliparous pregnant women testing negative for gestational diabetes

    Hiersch L, Shah BR, Berger H, Geary M, McDonald SD, Murray-Davis B, Halperin I, Fu L, Retnakaran R, Barrett J, Melamed N; For DOH NET (Diabetes Obesity And Hypertension In Pregnancy Research Network) and SOON (Southern Ontario Obstetrical Network Investigators)TM. Diabetes Metab. 2022; Jun 2 [Epub ahead of print]. DOI:

  • Association of newborn Apgar score with maternal admission to the intensive care unit

    Ray JG, Medcalf KE, Park AL. JAMA Pediatr. 2016; 170(1):88-9. Epub 2015 Nov 2.

  • Evaluating the clinical effect of female blood donors of child-bearing age on maternal and neonatal outcomes: a cohort study

    Chassé M, Tinmouth A, Goldman M, O’Brien S, Hawken S, Murphy M, Walker M, Sprague AE, Wilson K, van Walraven C, Fergusson DA. Transfus Med Rev. 2020; 34(2):117-23. Epub 2019 Dec 2. DOI:

  • Preterm birth, unplanned hospital contact, and mortality in infants born to teenage mothers in five countries: an administrative data cohort study

    Harron K, Verfuerden M, Ibiebele I, Liu C, Kopp A, Guttmann A, Ford J, van der Meulen J, Hjern A, Gilbert R. Paediatr Perinat Epidemiol. 2020; 34(6):645-54. Epub 2020 Apr 28. DOI:

  • Association of preexisting disability with severe maternal morbidity or mortality in Ontario, Canada

    Brown HK, Ray JG, Chen S, Guttmann A, Havercamp SM, Parish S, Vigod SN, Tarasoff LA, Lunsky Y. JAMA Netw Open. 2021; 4(2):e2034993. Epub 2021 Feb 8. DOI:

  • April 2017

    • Inflammatory bowel diseases on the rise in Canadian children
    • Low cancer screening rates among organ transplant patients in Ontario
    Research video
    • Baiju Shah on high thyroid cancer risk in Ontario immigrants from Southeast and East Asia
    ICES in the News
    • Two people a day die of opioid-related causes in Ontario
    • Many nursing home residents with dementia get medications of questionable benefit near the end of life
    • Where you live in Ontario could determine your risk of heart attack, stroke or dying of cardiovascular disease
    • No association between antidepressants during pregnancy and autism spectrum disorder in children
    You may also be interested in....
    • Do people who experience incarceration age more quickly? Exploratory analyses using retrospective cohort data on mortality from Ontario, Canada
    • Mental health services claims and adult onset asthma in Ontario, Canada
    • Impact of a provincial quality-improvement program on primary health care in Ontario: a population-based controlled before-and-after study
    • The association of frailty with outcomes and resource use after emergency general surgery: a population-based cohort study
    • Level of need, divertibility, and outcomes of newly admitted nursing home residents
    • The Cardiovascular Health in Ambulatory Care Research Team performance indicators for the primary prevention of cardiovascular disease: a modified Delphi panel study
  • Selective screening for gestational diabetes mellitus

    Naylor CD, Sermer M, Chen EL, Farine D. N Engl J Med. 1997; 337(22):1591-6.

  • Written patient information about triple-marker screening: a randomized, controlled trial

    Glazier R, Goel V, Holzapfel S, Summers A, Pugh P, Yeung M. Obstet Gynecol. 1997; 90(5):769-74.

  • Low rates of cervical cancer screening among urban immigrants: a population-based study in Ontario, Canada

    Lofters AK, Moineddin R, Hwang SW, Glazier RH. Med Care. 2010; 48(7):611-8.

  • Maternal and offspring outcomes in women with intellectual and developmental disabilities: a population-based cohort study

    Brown HK, Cobigo V, Lunsky Y, Vigod SN. BJOG. 2017; 124(5):757-65. Epub 2016 May 25.

  • Clinical predictors for diabetes screening in the first year postpartum after gestational diabetes

    Peticca P, Shah BR, Shea A, Clark HD, Malcolm JC, Walker M, Karovitch A, Brazeau-Gravelle P, Keely EJ. Obstet Med. 2014; 7(3):116-20. Epub 2014 Apr 12.

  • Heart failure and dysrhythmias after maternal placental syndromes: HAD MPS Study

    Ray JG, Schull MJ, Kingdom JC, Vermeulen MJ. Heart. 2012; 98(15):1136-41. Epub 2012 May 16.

  • Iron poisoning in young children: association with the birth of a sibling

    Juurlink DN, Tenenbein M, Koren G, Redelmeier DA. CMAJ. 2003; 168(12):1539-42.

  • Contribution of HIV to maternal morbidity among refugee women in Canada

    Wanigaratne S, Cole DC, Bassil K, Hyman I, Moineddin R, Urquia ML. Am J Public Health. 2015; 105(12):2449-56. Epub 2015 Oct 15.

  • October 2018

    • Comparison of prescribing practices for older adults treated by female versus male physicians: a retrospective cohort study
    • Reducing repeat imaging in hepato-pancreatico-biliary surgical cancer care through shared diagnostic imaging repositories
    • Frequency and impact of prescription nonsteroidal anti-inflammatory drug use among patients with hypertension, heart failure, or chronic kidney disease
    • Access to health care and medical health services use for Canadian military families posted to Ontario: a retrospective cohort study
    ICES Research Video
    • Variation in the health outcomes associated with frailty among home care clients: relevance of caregiver distress and client sex
    ICES in the News
    • Use of the emergency department as a first point of contact for mental health care by immigrant youth in Canada: a population-based study
    • Influenza vaccine effectiveness in preventing influenza-associated hospitalizations during pregnancy: a multi-country retrospective test negative design study, 2010-2016
    • Physician characteristics associated with ordering 4 low-value screening tests in primary care
    • Emergency department volume and outcomes for patients after chest pain assessment
    You may also be interested in...
    • Propensity-score matching with competing risks in survival analysis
    • Increased risk of traffic injury after a cerebrovascular event
    • Estimating the incidence of first-episode psychosis using population-based health administrative data to inform early psychosis intervention services
    • Association of cataract surgical outcomes with late surgeon career stages: a population-based cohort study
  • Maternal intellectual or developmental disability and newborn discharge to protective services

    Brown HK, Potvin LA, Lunsky Y, Vigod SN. Pediatrics. 2018; 142(6):e20181416. Epub 2018 Nov 6.

  • February 2019

    • Social licence and the general public’s attitudes toward research based on linked administrative health data, a qualitative study
    • Do doctors who order more routine medical tests diagnose more cancers? A population-based study from Ontario, Canada
    • Injection of opioids linked to increase in bacterial heart infections
    • Cause-specific mortality among HIV-infected people in Ontario, 1995–2014: a population-based retrospective cohort study
    • Association of surgical intervention for adhesive small-bowel obstruction with the risk of recurrence
    ICES in the News
    • How using your Ontario health card creates system change
    • Infertility treatment and risk of severe maternal morbidity: a propensity score-matched cohort study
    • Association of transvaginal mesh complications with the risk of new-onset depression or self-harm in women with a midurethral sling
    • Inflammatory bowel disease and new-onset psychiatric disorders in pregnancy and post-partum: a population based cohort study
    You may also be interested in...
    • The risk of heart failure and other cardiovascular hospitalizations after early stage breast cancer: a matched cohort study
    • One-year survival and admission to hospital for cardiovascular events among older residents of long-term care facilities who were prescribed intensive- and moderate-dose statins
    • Healthcare utilization costs of emerging adults with mood and anxiety disorders in an early intervention treatment program compared to a matched cohort
    • Survival and health care use after feeding tube placement in children with neurologic impairment
    • Disparities in breast cancer diagnosis for immigrant women in Ontario and BC: results from the CanIMPACT study
  • Spatiotemporal variations in ambient ultrafine particles and the incidence of childhood asthma

    Lavigne E, Donelle J, Hatzopoulou M, Van Ryswyk K, van Donkelaar A, Martin RV, Chen H, Stieb DM, Gasparrini A, Crighton E, Yasseen III AS, Burnett RT, Walker M, Weichenthal S. Am J Respir Crit Care Med. 2019; 199(12):1487-95. Epub 2019 Feb 20. DOI: 10.1164/rccm.201810-1976OC.

  • August 2019

    • High-performing physicians are more likely to participate in a research study: findings from a quality improvement study
    • Prevalence of inappropriateness of parenteral vitamin B12 administration in Ontario Canada
    • Association of mirabegron with the risk of arrhythmia in adult patients 66 years or older—a population-based cohort study
    • Antipsychotic initiation among adults with intellectual and developmental disabilities in Ontario: a population-based cohort study
    ICES in the News
    • Association of primary care continuity with outcomes following transition to adult care for adolescents with severe mental illness
    • A 15-year population-based investigation of sexual assault cases across the province of Ontario, Canada, 2002–2016
    • Health outcomes of young children born to mothers who received 2009 pandemic H1N1 influenza vaccination during pregnancy: retrospective cohort study
    • Rates of emergency department visits attributable to alcohol use in Ontario from 2003 to 2016: a retrospective population-level study
    You may also be interested in...
    • End-of-life care in individuals with respiratory diseases: a population study comparing the dying experience between those with chronic obstructive pulmonary disease and lung cancer
    • Regional variation of premature mortality in Ontario, Canada: a spatial analysis
    • The time-varying effect of radiotherapy after breast-conserving surgery for DCIS
    • The impact of the long-term care homes act and public reporting on physical restraint and potentially inappropriate antipsychotic use in Ontario's long-term care homes
    • Can administrative data improve the performance of cancer clinical trial economic analyses?
    • Comparison of outcomes in elective endovascular aortic repair vs open surgical repair of abdominal aortic aneurysms
  • May 2020

    • COVID-19 Laboratory Testing in Ontario: Patterns of Testing and Characteristics of Individuals Tested, as of April 30, 2020
    • Population-based estimates of health care utilization and expenditures by adults during the last 2 years of life in Canada’s single-payer health system
    • Association between traumatic brain injury and prison charges: a population-based cohort study
    • Five-year risk of admission to long-term care home and death for older adults given a new diagnosis of dementia: a population-based retrospective cohort study
    • Emergency department use by pregnant women in Ontario: a retrospective population-based cohort study
    ICES in the News
    • Inequity in access to transcatheter aortic valve replacement: a pan-Canadian evaluation of wait-times
    • Physician-based availability of psychotherapy in Ontario: a population-based retrospective cohort study
    You may also be interested in...
    • An international cohort study of birth outcomes associated with hospitalized acute respiratory infection during pregnancy
    • Urban green space and the risks of dementia and stroke
    • Diabetes-induced eye disease among First Nations people in Ontario: a longitudinal, population-based cohort study
    • Association between immigration status and acute stroke care: a retrospective study
    • Long-term survival and costs following extracorporeal membrane oxygenation in critically ill children—a population-based cohort study
    • Use of sodium–glucose cotransporter-2 inhibitors and risk of acute kidney injury in older adults with diabetes: a population-based cohort study
    • Impact of stopping trastuzumab in early breast cancer: a population-based study in Ontario, Canada
    • Preterm birth, unplanned hospital contact, and mortality in infants born to teenage mothers in five countries: an administrative data cohort study
  • August 2020

    • Death and long-term disability after gun injury: a cohort analysis
    • Patient-level characteristics and inequitable access to inpatient electroconvulsive therapy for depression: a population-based cross-sectional study
    • Trends in the medical use of synthetic cannabinoids among older adults in Ontario, Canada
    ICES in the News
    • COVID-19 Laboratory Testing in Ontario: Patterns of Testing and Characteristics of Individuals Tested, as of April 30, 2020
    • Clinical effectiveness of cardiac noninvasive diagnostic testing in outpatients evaluated for stable coronary artery disease
    • Maternal cannabis use in pregnancy and child neurodevelopmental outcomes
    You may also be interested in...
    • Sex- and age-specific differences in COVID-19 testing, cases and outcomes: a population-wide study in Ontario, Canada
    • Direct and indirect pathways between low-income status and becoming a high-cost healthcare user in Ontario, Canada: a mediation analysis of health risk behaviors
    • Quality of antenatal care for women who experience imprisonment in Ontario, Canada
    • Persistent socioeconomic inequalities in location of death and receipt of palliative care: a population-based cohort study
    • Material deprivation and access to cancer care in a universal health care system
    • Receipt of routine preventive care among infant daughters and sons of immigrant mothers in Ontario, Canada: a retrospective cohort study
    • Population trends in lobular carcinoma of the breast: the Ontario experience
    • Severe nutritional complications after bariatric surgery in Ontario adults: a population-based descriptive study
    • Health care use and costs of children, adolescents, and young adults with somatic symptom and related disorders
  • April 2021

    • Utilization rates of pancreatectomy, radical prostatectomy, and nephrectomy in New York, Ontario, and New South Wales, 2011 to 2018
    • Obstetric and perinatal health outcomes after pertussis vaccination during pregnancy in Ontario, Canada: a retrospective cohort study
    • Injury-related deaths in the Ontario provincial trauma system: a retrospective population-based cohort analysis
    • Impact of the COVID-19 pandemic on skin cancer diagnosis: a population-based study
    • Assessing the validity of administrative health data for the identification of children and youth with autism spectrum disorder in Ontario
    ICES in the News
    • Testing, infection and complication rates of COVID-19 among people with a recent history of homelessness in Ontario, Canada: a retrospective cohort study
    • Access to cancer surgery in a universal health care system during the COVID-19 pandemic
    • Association between antihypertensive medications and risk of skin cancer in people older than 65 years: a population-based study
    • COVID-19 in Ontario: Notable findings for the week of April 4-10, 2021
    • Long-term risk of hypertension after surgical repair of congenital heart disease in children
    You may also be interested in...
    • Association of source country gender inequality with experiencing assault and poor mental health among young female immigrants to Ontario, Canada
    • Race and incarceration: the representation and characteristics of Black people in provincial correctional facilities in Ontario, Canada
    • Adverse event rates associated with oral anticoagulant treatment early versus later after hospital discharge in older adults: a retrospective population-based cohort study
    • Disability-free survival after major cardiac surgery: a population-based retrospective cohort study
    • Bariatric surgery and cardiovascular outcomes in patients with obesity and cardiovascular disease: a population-based retrospective cohort study
    • Looking beyond administrative health care data: the role of socioeconomic status in predicting future high-cost patients with mental health and addiction
    • Predictive performance of machine and statistical learning methods: Impact of data-generating processes on external validity in the "large N, small p" setting
    • Perforation and post-polypectomy bleeding complicating colonoscopy in a population-based screening program
  • May 2021

    • Variable impact of COVID-19 on urgent intervention in Ontario
    • Comparison of childhood asthma incidence in 3 neighbouring cities in southwestern Ontario: a 25‑year longitudinal cohort study
    • Suicide and self-harm in adult survivors of critical illness: population based cohort study
    • Delay of pregnancy among physicians vs nonphysicians
    ICES in the News
    • Individual and social determinants of SARS-CoV-2 testing and positivity in Ontario, Canada: a population-wide study
    • Perinatal outcomes during the COVID-19 pandemic in Ontario, Canada
    • COVID-19 in Ontario: Highlights for the week of May 2–8, 2021
    • Association between bariatric surgery and major adverse diabetes outcomes in patients with diabetes and obesity
    You may also be interested in...
    • Risk factors for outbreaks of SARS-CoV-2 infection at retirement homes in Ontario, Canada: a population-level cohort study
    • The requirement for surgery and subsequent 30-day mortality in patients with COVID-19
    • Is coronavirus disease 2019 associated with indicators of long-term bladder dysfunction?
    • Sex differences in multimorbidity and polypharmacy trends: a repeated cross-sectional study of older adults in Ontario, Canada
    • Health care utilization in medically complex people living with HIV before and after admission to an HIV-specific community facility: a pre–post comparison study
    • Health care costs of rheumatoid arthritis: a longitudinal population study
    • Health care utilisation and costs associated with different treatment protocols for newly diagnosed childhood acute lymphoblastic leukaemia: a population-based study in Ontario, Canada
    • Derivation and validation of a two-variable index to predict 30-day outcomes following heart failure hospitalization
  • June 2021

    • Postpartum mental illness during the COVID-19 pandemic: a population-based, repeated cross-sectional study
    • Association of socioeconomic status with medical assistance in dying: a case-control analysis
    • Inequities in access to primary care among opioid recipients in Ontario, Canada: a population-based cohort study
    • Development and validation of a machine learning model using administrative health data to predict onset of type 2 diabetes
    ICES in the News
    • A population-based analysis of the impact of the COVID-19 pandemic on common abdominal and gynecological emergency department visits
    • COVID-19 in Ontario: Highlights for the week of June 6–12, 2021
    • Adherence at 2 years with distribution of essential medicines at no charge: the CLEAN Meds randomized clinical trial
    You may also be interested in...
    • Stroke care and case fatality in people with and without schizophrenia: a retrospective cohort study
    • Childhood food insecurity and incident asthma: a population-based cohort study of children in Ontario, Canada
    • Lung cancer inequalities in stage of diagnosis in Ontario, Canada
    • Patterns of cardiovascular risk factors in the years before pregnancy in nulliparous women with and without preterm birth and small-for-gestational-age delivery
    • Association between end-of-life cancer care and immigrant status: a retrospective cohort study in Ontario, Canada
    • Primary care-based smoking cessation treatment and subsequent healthcare service utilisation: a matched cohort study of smokers using linked administrative healthcare data
    • Morbidity and mortality reduction associated with polysomnography testing in idiopathic pulmonary fibrosis: a population-based cohort study
    • Glycemic control in transition-aged versus early adults with type 1 diabetes and the effect of a government-funded insulin pump program
  • September 2021

    • Understanding COVID-19 risk in patients with immune mediated inflammatory diseases: a population-based analysis of SARS-CoV-2 testing
    • Outcomes and healthcare resource utilization in adult congenital heart disease patients with heart failure
    • Opioid use after outpatient elective general surgery: quantifying the burden of persistent use
    ICES in the News
    • Risk of cancer-specific death for patients diagnosed with neuroendocrine tumors: a population-based analysis
    • COVID-19 positivity rates, hospitalizations and mortality of adults with and without intellectual and developmental disabilities in Ontario, Canada
    • COVID-19 testing and percent positivity in Ontario
    • Comparison of 4-year health care expenditures associated with roux-en-y gastric bypass vs sleeve gastrectomy
    • Prediction of risk of prolonged post-concussion symptoms: Derivation and validation of the TRICORDRR (Toronto Rehabilitation Institute Concussion Outcome Determination and Rehab Recommendations) score
    You may also be interested in...
    • Incidence of chronic immune-mediated inflammatory diseases after diagnosis with Kawasaki disease: a population-based cohort study
    • Association of surgical experience with risk of complication in total hip arthroplasty among patients with severe obesity
    • Incidence, predictors and patterns of care of patients with very severe hypertriglyceridemia in Ontario, Canada: a population-based cohort study
    • Renin-angiotensin-aldosterone system inhibitors and major cardiovascular events and acute kidney injury in patients with coronary artery disease
    • International comparison of spending and utilization at the end of life for hip fracture patients
    • Risk of acute kidney injury after hypertensive disorders of pregnancy: a population-based cohort study
    • Health services utilization prior to amyotrophic lateral sclerosis diagnosis: a province-wide study of individuals treated with riluzole in Ontario, Canada
    • The impact of language on emergency department visits, hospitalizations, and length of stay among home care recipients
  • Caesarean birth in women with infertility: population-based cohort study

    Richmond E, Ray JG, Pudwell J, Djerboua M, Gaudet L, Walker M, Smith GN, Velez MP. BJOG. 2022; 129(6):908-16. Epub 2021 Nov 19. DOI:

  • Attention-deficit hyperactivity disorder in children born to mothers with infertility: a population-based cohort study

    Fine A, Dayan N, Djerboua M, Pudwell J, Fell DB, Vigod SN, Ray JG, Velez MP. Hum Reprod. 2022; Jun 7 [Epub ahead of print]. DOI:

  • Perinatal health of women with intellectual and developmental disabilities and comorbid mental illness

    Brown HK, Cobigo V, Lunsky Y, Dennis CL, Vigod S. Can J Psychiatry. 2016; 61(11):714-23. Epub 2016 May 5.

  • Sex ratios at birth after induced abortion

    Urquia ML, Moineddin R, Jha P, O’Campo PJ, McKenzie K, Glazier RH, Henry DA, Ray JG. CMAJ. 2016; 188(9):E181-90. Epub 2016 Apr 11.

  • Serious preeclampsia among different immigrant groups

    Urquia ML, Ying I, Glazier RH, Berger H, De Souza LR, Ray JG. J Obstet Gynaecol Can. 2012; 34(4):348-52.