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Publication Results (87)

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  • Health behavior associated with influenza vaccination among healthcare workers in long-term-care facilities

    Manuel DG, Henry B, Hockin J, Naus M. Infect Control Hosp Epidemiol. 2002; 23(10):609-14.

  • Characteristics of patients vaccinated against influenza in physician offices versus pharmacies and predictors of vaccination location: a cross-sectional study

    Waite NM, Cadarette SM, Campitelli MA, Consiglio GP, Houle SKD, Kwong JC. CMAJ Open. 2019; 21; 7(2):E421-29. Epub 2019 Jun 21. DOI: 10.9778/cmajo.20180189.

  • Using OHIP physician billing claims to ascertain individual influenza vaccination status

    Kwong JC, Manuel DG. Vaccine. 2007; 25(7):1270-4. Epub 2006 Oct 19.

  • Infant respiratory outcomes associated with prenatal exposure to maternal 2009 A/H1N1 influenza vaccination

    Fell DB, Wilson K, Ducharme R, Hawken S, Sprague AE, Kwong JC, Smith G, Wen SW, Walker MC. PLoS One. 2016; 11(8):e0160342.

  • Influenza vaccine effectiveness among patients with cancer: a population-based study using health administrative and laboratory testing data from Ontario, Canada

    Blanchette PS, Chung H, Pritchard KI, Earle CC, Campitelli MA, Buchan SA, Schwartz KL, Crowcroft NS, Gubbay JB, Karnauchow T, Katz K, McGeer AJ, McNally JD, Richardson DC, Richardson SE, Rosella LC, Simor A, Smieja M, Zahariadis G, Campigotto A, Kwong JC. J Clin Oncol. 2019; 37(30):2795-804. Epub 2019 Aug 29. DOI: 10.1200/JCO.19.00354.

  • The impact of repeated vaccination using 10-year vaccination history on protection against influenza in older adults: a test-negative design study across the 2010/11 to 2015/16 influenza seasons in Ontario, Canada

    Kwong JC, Chung H, Jung JKH, Buchan SA, Campigotto A, Campitelli MA, Crowcroft NS, Gubbay JB, Karnauchow T, Katz K, McGeer AJ, McNally JD, Richardson DC, Richardson SE, Rosella LC, Schwartz KL, Simor A, Smieja M, Zahariadis G; Canadian Immunization Research Network (CIRN). Euro Surveill. 2020; 25(1):1900245. Epub 2020 Jan 9. DOI:

  • Influenza vaccination rates in Ontario children: implications for universal childhood vaccination policy

    Moran K, Maaten S, Guttmann A, Northrup D, Kwong JC. Vaccine. 2009; 27(17):2350-5. Epub 2009 Feb 13.

  • Health outcomes of young children born to mothers who received 2009 pandemic H1N1 influenza vaccination during pregnancy: retrospective cohort study

    Walsh LK, Donelle J, Dodds L, Hawken S, Wilson K, Benchimol EI, Chakraborty P, Guttmann A, Kwong JC, MacDonald NE, Ortiz JR, Sprague AE, Top KA, Walker MC, Wen SW, Fell DB. BMJ. 2019; 366:l4151. Epub 2019 Jul 10. DOI: 10.1136/bmj.l4151.

  • Using Ontario Health Insurance Plan physician billing claims to ascertain individual influenza immunization status: an updated validation study

    Schwartz KL, Jembere N, Campitelli MA, Buchan SA, Chung H, Kwong JC. CMAJ Open. 2016; 4(3):E463-70.

  • Narcolepsy and adjuvanted pandemic influenza A (H1N1) 2009 vaccines – multi-country assessment

    Weibel D, Sturkenboom M, Black S, de Ridder M, Dodd C, Bonhoeffer J, Vanrolleghem A, van der Maas N, Lammers GJ, Overeem S, Gentile A, Giglio N, Castellano V, Kwong JC, Murray BJ, Cauch-Dudek K, Juhasz D, Campitelli M, Datta AN, Kallweit U, Huang WT, Huang YS, Hsu CY, Chen HC, Giner-Soriano M, Morros R, Gaig C, Tió E, Perez-Vilar S, Diez-Domingo J, Puertas FJ, Svenson LW, Mahmud SM, Carleton B, Naus M, Arnheim-Dahlström L, Pedersen L, DeStefano F, Shimabukuro TT. Vaccine. 2018; 36(41):6202-11. Epub 2018 Aug 16.

  • Epidemiology and clinical outcomes of hospitalizations for acute respiratory or febrile illness and laboratory-confirmed influenza among pregnant women during six influenza seasons, 2010-2016

    Dawood FS, Garg S, Fink RV, Russell ML, Regan AK, Katz MA, Booth S, Chung H, Klein NP, Kwong JC, Levy A, Naleway A, Riesel D, Thompson MG, Wyant BE, Fell DB; PREVENT workgroup. J Infect Dis. 2020; 221(10):1703-12. Epub 2019 Dec 26. DOI:

  • Surge capacity associated with restrictions on nonurgent hospital utilization and expected admissions during an influenza pandemic: lessons from the Toronto severe acute respiratory syndrome outbreak

    Schull MJ, Stukel TA, Vermeulen MJ, Guttmann A, Zwarenstein M. Acad Emerg Med. 2006; 13(11):1228-31. Epub 2006 Jun 28.

  • An international cohort study of birth outcomes associated with hospitalized acute respiratory infection during pregnancy

    Regan AK, Feldman BS, Azziz-Baumgartner E, Naleway AL, Williams J, Wyant BE, Simmonds K, Effler PV, Booth S, Ball SW, Katz MA, Fink RV, Thompson MG, Chung H, Kwong JC, Fell DB. J Infect. 2020; 81(1):48-56. Epub 2020 Apr 20. DOI:

  • Validating International Classification of Disease 10th Revision algorithms for identifying influenza and respiratory syncytial virus hospitalizations

    Hamilton MA, Calzavara A, Emerson SD, Djebli M, Sundaram ME, Chan AK, Kustra R, Baral SD, Mishra S, Kwong JC. PLoS One. 2021; 16(1):e0244746. Epub 2021 Jan 7. DOI:

  • The association between obesity and outpatient visits for acute respiratory infections in Ontario, Canada

    Campitelli MA, Rosella LC, Kwong JC. Int J Obes (Lond). 2013; 38(1):113-9. Epub 2013 Apr 22.

  • January 2007

    • Study demonstrates need for comprehensive influenza immunization registry in Ontario
    • ICU patients have increased risk of discontinuing medications for chronic conditions
    • Study examines differences in statin prescriptions between Ontario and BC
    • EDs that treat more heart attack patients are less likely to miss the diagnosis
    • Nurse-performed screening program for colorectal cancer can be safe and effective
  • June 2012

    • New decision-support tool helps ED physicians predict risk of death in heart failure patients
    • Influenza vaccine coverage very low for Ontario children under age two
    • Antidepressant exposure linked to form of glaucoma in older adults
    • Better safe than sorry not always true when it comes to diagnoses
    • Richest and poorest people in Toronto hospitalized for different reasons
  • May 2006

    • SSRI antidepressants associated with increased risk of suicide in first month of therapy
    • Women with diabetes may have increased risk of breast cancer
    • Ontario's universal influenza program having a positive impact on vaccination rates
    • ICES report shows Ontario's health information is in need of urgent upgrades
    • Prescribing of Alzheimer's drugs varies among Canadian family physicians despite guidelines
  • December 2009

    • Influenza vaccine safe for patients with myasthenia gravis
    • Less than half of Ontarians with depression see a doctor for treatment: POWER Study
    • Study identifies hospital markers linked to improved survival rates for heart attack patients
    • Youth with diabetes likely to be hospitalized while transitioning to adult care
    • One in four Ontario hospitals change cardiac care policies after public report cards released
  • April 2009

    • Ontario achieves modest gains with universal influenza immunization program
    • Anesthesia consultation before surgery reduces hospital stay
    • Diabetic patients with heart disease receive more benefit from paclitaxel-eluting stents
    • Statin therapy associated with reduced mortality at five years in heart failure patients
    • Wealthier heart attack survivors more likely to make needed lifestyle changes
  • October 2004

    • Study offers insights into seasonal patterns for influenza and pneumonia hospitalizations
    • Certain common medications can cause lithium toxicity in the elderly
    • Ontario wait times for arthritis-related joint surgeries increase by up to 9 weeks
    • Beta-blocker therapy safe for certain heart failure patients
    • Study maps mammography use in large urban cities
  • May 2013

    • Influenza vaccine safe for children with inflammatory bowel disease
    • Obesity linked to increased risk of outpatient visits for respiratory infections
    • Study forecasts almost 1 in 8 Ontarians with asthma in 2022
    • Women with developmental disabilities less likely to be screened for breast, cervical cancer
    • Young female cancer survivors experience a small reduction in likelihood of childbirth
  • June 2013

    • Rates of diabetes among Chinese Canadians increased 15-fold in 10 years
    • Two common COPD drugs have similar increased risk of cardiovascular events
    • Implementation of integrated stroke care system leads to improved outcomes and care
    • Formalizing existing provider networks may lead to improved Ontario health care system
    • Study finds seasonal influenza vaccination effective in young children
  • Can routinely collected laboratory and health administrative data be used to assess influenza vaccine effectiveness? Assessing the validity of the Flu and Other Respiratory Viruses Research (FOREVER) Cohort

    Kwong JC, Buchan SA, Chung H, Campitelli MA, Schwartz KL, Crowcroft NS, Jackson ML, Karnauchow T, Katz K, McGeer AJ, McNally DJ, Richardson DC, Richardson SE, Rosella LC, Simor A, Smieja M, Zahariadis G, Campigotto A, Gubbay JB. Vaccine. 2019; 37(31):4392-400. Epub 2019 Jun 17. DOI: 10.1016/j.vaccine.2019.06.011.

  • Why collect individual-level vaccination data?

    Writing team for the Public Health Agency of Canada/Canadian Institutes of Health Research Influenza Research Network Vaccine Coverage Theme Group. CMAJ. 2010; 182(3):273-5. Epub 2010 Jan 4.

  • Ontario Burden of Infectious Disease Study

    Kwong JC, Crowcroft NS, Campitelli MA, Ratnasingham S, Daneman N, Deeks SL, Manuel DG. December 2010

  • 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
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    • 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
  • February 2020

    • Mortality in a cohort of 3.1 million children, adolescents and young adults
    • Factors associated with emergency department presentation after total joint arthroplasty: a population-based retrospective cohort study
    • Sex differences in care need and survival in patients admitted to nursing home poststroke
    • Evaluation of opioid discontinuation after non-orthopaedic surgery among chronic opioid users: a population-based cohort study
      ICES in the News
      • First-ever ischemic stroke and incident major adverse cardiovascular events in 93 627 older women and men
      • Closed for business? Using a mixture model to explore the supply of psychiatric care for new patients
      • Utilization of advanced cardiovascular therapies in the United States and Canada: an observational study of New York and Ontario administrative data
      • Hydromorphone and the risk of infective endocarditis among people who inject drugs: a population-based, retrospective cohort study
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      • The impact of repeated vaccination using 10-year vaccination history on protection against influenza in older adults: a test-negative design study across the 2010/11 to 2015/16 influenza seasons in Ontario, Canada
      • Impact of a publicly funded herpes zoster immunization program on the burden of disease in Ontario, Canada: a population-based study
      • Socioeconomic status and days alive and out of hospital after major elective noncardiac surgery: a population-based cohort study
      • Infant and maternal outcomes for women who experience imprisonment in Ontario Canada: a retrospective cohort study
      • Health care utilization for musculoskeletal issues during the pre-diagnosis period in psoriatic arthritis: a population-based study
      • Incidence and outcomes of invasive fungal infection among solid organ transplant recipients: a population-based cohort study
      • Impact of diabetes on colorectal cancer stage and mortality risk: a population-based cohort study
    • Urban emergency department overcrowding: defining the problem and eliminating misconceptions

      Schull MJ, Slaughter PM, Redelmeier DA. CJEM. 2002; 4(2):76-83.

    • ICES report: five policy recommendations from Toronto's SARS outbreak to improve the safety and efficacy of restrictions on hospital admissions to manage infectious disease outbreaks

      Schull MJ, Stukel TA, Zwarenstein M, Guttmann A, Alter DA, Manuel DG. Healthc Q. 2009; 12(1):30-2.

    • Implementation of electronic medical records: effect on the provision of preventive services in a pay-for-performance environment

      Greiver M, Barnsley J, Glazier RH, Moineddin R, Harvey BJ. Can Fam Physician. 2011; 57(10):e381-9. Epub 2011 Oct 1.

    • January 2018

      Call for abstracts: IPDLN 2018 Conference
      • Diabetes risk in childhood cancer survivors: a population-based study
      • Association between handover of anesthesia care and adverse postoperative outcomes among patients undergoing major surgery
        ICES in the News
        • Acute myocardial infarction after laboratory-confirmed influenza infection
        • Effect of air quality alerts on human health: a regression discontinuity analysis in Toronto, Canada
        ICES Top 17 of '17
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        • Temporal trends in mental health service utilization across outpatient and acute care sectors: a population-based study from 2006 to 2014
        • The economic burden of cancer care in Canada: a population-based cost study
        • Elevated incidence of atrial fibrillation and stroke in patients with atrial flutter – a population-based study
        • The relation between food insecurity and mental health care service utilization in Ontario
        • Intergenerational abortion tendency between mothers and teenage daughters: population based cohort study
        • The impact of diabetes on breast cancer treatments and outcomes: a population-based study
        • Predictors of specialized pediatric palliative care involvement and impact on patterns of end-of-life care in children with cancer
      • August 2018

        • Geographic Variation in Primary Care Need, Service Use and Providers in Ontario, 2015/16
        • Food insecurity status and mortality among adults in Ontario, Canada
        • Association between statin use and cardiovascular events after carotid artery revascularization
        • Rapid repeat pregnancy among women with intellectual and developmental disabilities: a population-based cohort study
          ICES in the News
          • Contributions of prescribed and non-prescribed opioids to opioid related deaths: a population based cohort study in Ontario, Canada
          • Pregabalin and the risk for opioid-related death: a nested case-control study
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          • Characteristics of nurse practitioner practice in family health teams in Ontario, Canada
          • Medical costs of delayed hip fracture surgery
          • Patterns of mortality among adults with intellectual and developmental disabilities in Ontario 
          • Narcolepsy and adjuvanted pandemic influenza A (H1N1) 2009 vaccines – multi-country assessment
          • Unmet need for mental health services among people screened but not admitted to an early psychosis intervention program
          • A matched case-control study to assess the association between non-steroidal anti-inflammatory drug use and thrombotic microangiopathy
        • October 2019

          • Influenza vaccine effectiveness in preventing hospitalizations in older patients with chronic obstructive pulmonary disease
          • Association between physician intensity of antibiotic prescribing and the prescription of benzodiazepines, opioids and proton-pump inhibitors to nursing home residents: a population-based observational study
          • Cardiovascular consequences of obstructive sleep apnea in women: a historical cohort study
          ICES in the News
          • Prevalence of inappropriateness of parenteral vitamin B12 administration in Ontario, Canada
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          • One-year home-time and mortality after thrombolysis compared with nontreated patients in a propensity-matched analysis
          • Prescription synthetic oral cannabinoid use among older adults with chronic obstructive pulmonary disease: a population-based cohort study
          • Time trends in opioid prescribing among Ontario long-term care residents: a repeated cross-sectional study
          • Association of early-stage breast cancer and subsequent chemotherapy with risk of atrial fibrillation
          • An opioid prescription for men undergoing minor urologic surgery is associated with an increased risk of new persistent opioid use
          • Emergency department use in people who experience imprisonment in Ontario, Canada
          • Data variability across Canadian administrative health databases: differences in content, coding, and completeness
        • Seasonality of primary care utilization for respiratory diseases in Ontario: a time-series analysis

          Moineddin R, Nie JX, Domb G, Leong AM, Upshur RE. BMC Health Serv Res. 2008; 8:160.

        • Volume matters: physician practice characteristics and immunization coverage among young children insured through a universal health plan

          Guttmann A, Manuel D, Dick PT, To T, Lam K, Stukel TA. Pediatrics. 2006; 117(3):595-602.

        • Measuring data reliability for preventive services in electronic medical records

          Greiver M, Barnsley J, Glazier RH, Harvey BJ, Moineddin R. BMC Health Serv Res. 2012; 12:116. Epub 2012 May 14.

        • Croup hospitalizations in Ontario: a 14-year time-series analysis

          Segal AO, Crighton EJ, Moineddin R, Mamdani M, Upshur RE. Pediatrics. 2005; 116(1):51-5.

        • Seasonal variation in rates of emergency room visits and acute admissions following recommended infant vaccinations in Ontario, Canada: a self-controlled case series analysis

          Hawken S, Potter BK, Benchimol EI, Little J, Ducharme R, Wilson K. Vaccine. 2014; 32(52):7148-53. Epub 2014 Nov 1.

        • 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
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          • 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