About Sickkids
About SickKids

Teresa To, PhD

Research Institute
Senior Scientist
Child Health Evaluative Sciences

University of Toronto
Dalla Lana Graduate School of Public Health

Institute of Health Policy, Management and Evaluation

Institute of Medical Sciences

Chair Positions

Contributor Oversight Committee

The Hospital for Sick Children
Biostatistics, Design and Analysis
Scientific Director

Other Positions

Institute for Clinical Evaluative Sciences
Senior Adjunct Scientist

Phone: 416-813-8498
Fax: 416-813-5979
e-mail: teresa.to@sickkids.ca

Brief Biography

Dr. Teresa To has developed a population-based research program that focuses on childhood asthma. Using paediatric health databases, she examines factors that influence the health of children with asthma and their health outcomes. Her current asthma care research program spans from the acute, primary care settings to the population levels. Dr. To also maintains a cross-appointment at the Institute for Clinical Evaluative Sciences (ICES) that allows her to use administrative databases to study the healthcare utilization, access to care and practice patterns for a variety of medical and surgical conditions.

Research Interests

  • Child health services research
  • Population-based outcomes research
  • Asthma surveillance and asthma health indicators
  • Childhood asthma

Research Activities

Dr. To has been involved in over 50 funded research projects as an investigator. Currently, with over one million dollars in research funding, she is the principal investigator of four funded research projects, all of which are focused on measuring and quantifying the impacts of asthma.

Outlined below are four of her current major research projects:

  • Asthma Surveillance and Measurement of Health Outcomes in Ontario – the Ontario Asthma Surveillance Information System (OASIS) visit website »»
  • The Ontario Work-Related Asthma Surveillance (OWRAS) Project visit website »»
  • RESpiratory Population-based Outcomes Network: Studies and Evaluations (RESPONSE)
  • The Respiratory GREAT Network visit website »»

Future Research Interests

Over the next few years, Dr. To plans to study and monitor asthma health across the life span and at national and global levels. Through national and international collaborations, evidence generated from her research plan will guide the development of intervention programs to meet the health care needs of those diagnosed and living with asthma.

Supported by the Global Alliance against Respiratory Diseases (GARD) at the World Health Organization (WHO) in Geneva, Dr. To has established the Respiratory Global Research And Training Network (GREAT). The GREAT Network is a methodology collaborating centre where all GARD-related surveillance, outcome monitoring and evaluation activities will be centralized and supervised. Dr. To will be facilitating the training for visiting fellows or scientists from participating countries.

External Funding

  • Evaluating a Knowledge Translation Strategy for Pancreatic Cancer Surgery in Ontario: 1995-2003. Simunovic, M, Wright F, To T, Urbach D, Brown A, Gagliardi A, Elit L, Tandan V, Holowaty E, Langer B, Fitch M, Davis D, Levine M: CIHR (2005–2008)
  • A Pilot Implementation and Evaluation of an Occupational Asthma Surveillance System in Ontario. To T, Holness L, Lougheed D, Cicutto L, Haines T, Tarlo S: Ontario Ministry of Health and Long-Term Care (2006–2008)
  • Canadian National Breast Screening Study (NBSS). Narod, S, To T: Canadian Breast Cancer Research Alliance (2006–2009)
  • The Canadian Healthy Infant Longitudinal Development (CHILD) Study. Sears M (PI), To T (Co-I), Scott J, Befus AD, Cherry NM, Becker A: CIHR (2007–2013)
  • Death in Chronic Obstructive Pulmonary Disease (COPD) in the Ontario Population. Stanbrook M, To T: Ontario Thoracic Society (2007–2008)
  • Respiratory Population-based Outcomes Network: Studies and Evaluations (RESPONSE). To T, Gershon A, Guttmann A, Lougheed M, Crighton E, Fisman D, Dell S, Stanbrook M: CIHR (2007–2010)
  • Establishing and Validating Evidence - Based Algorithms and Indicators for Longitudinal Chronic Respiratory Disease Surveillance. To T: Public Health Agency of Canada (2008–2009)
  • The Respiratory Global Research And Training (GREAT) Network. To T: AllerGen NCE Inc. (2008–2009)
  • Providing Evidence on the Impact of Medication on Chronic Obstructive Pulmonary Disease Outcomes. Gershon A, To T, Upshur R, Wang C, Stukel T: Ontario Ministry of Health and Long-Term Care (2008–2009)


  • A 2001 recipient of the CIHR/MOHLC 5-year investigator award
  • Recipient of the University of Toronto, Life Sciences Committee, Dales Award in Medical Research (2008-2011)


Gershon AS, Wang L, To T, Luo J, Upshur REG: Survival with Tiotropium compared to long-acting beta-2-agonists in Chronic Obstructive Pulmonary Disease. COPD: Journal of Chronic Obstructive Pulmonary Disease 2008: 5 (4): pp 229-34.

To T, Estrabillo E, Wang C, Cicutto L: Examining intra-rater and inter-rater response agreement: a medical chart abstraction study of a community-based asthma care program. BMC Medical Research Methodology 2008: 8(29): pp 1-9.

To T, Dell S, Dick P, Cicutto L: The burden of illness experienced by young children associated with asthma: a population-based cohort study. Journal of Asthma 2008: 45(1): pp 45-9.

Parshuram CS, To T, Seto W, Trope A, Koren G, Laupacis A: Systematic evaluation of errors occurring during the preparation of intravenous medication. Canadian Medical Association Journal 2008: 178(1): pp 42-8.

To T, Gershon A, Wang C, Dell S, Cicutto L: Persistence and remission in childhood asthma - a population-based asthma birth cohort study. Archives of Pediatrics and Adolescent Medicine 2007: 161(12): pp 1197-1204.

Guttmann A, Zagorski B, Austin PC, Schull M, Razzaq A, To T, Anderson G: Effectiveness of emergency department asthma management strategies on return visits in children: a population-based study. Pediatrics 2007: 120(6): pp e1402-10.

Pole JD, Mustard CA, To T, Beyene J, Allen AC: Antenatal steroid therapy and childhood asthma: is there a possible link? Medical Hypothses 2007: 70(5): pp 981-9.

Gershon A, Wang C, Cicutto L, To T: ICES Report. The burden of asthma: can it be eased? Healthcare Quarterly 2007: 10(1): pp 22-4.

Lougheed D, Garvey N, Chapman K, Cicutto L, Dales R, Day A, Hopman W, Lam M, Sears MR, Szpiro K, To T, Paterson N: The Ontario Asthma Regional Variation Study: emergency department visit rates and hospitalizations. Chest 2006: 129: pp 909-17.

Tai D, Dick PT, To T, Wright J: Development of the pediatric comorbidity prediction model. Archives of Pediatrics and Adolescent Medicine 2006: 160: pp 293-9.

To T, Dell S, Dick PT, Cicutto L, MacLusky IB, Vydykhan TN, Harris JK: Case verification of children with asthma in Ontario. Pediatric Allergy and Immunology 2006: 17: pp 69-76.

Guttmann A, Doug M, Dick PT, To T, Lam K, Stukel T: Volume matters: physician practice characteristics and immunization coverage in young children insured by a universal health plan. Pediatrics 2006: 117: pp 595-602.

Agha M, Williams J, Marrett L, To T, Dodds L: Determinants of survival in children with congenital abnormalities: a long-term population-based cohort study. Birth Defects Research. Part A, Clinical and Molecular Teratology 2006: 76: pp 46-54.

To T, Gershon A, Tassoudji M, Guan J, Wang C, Estrabillo E, Cicutto L: The burden of asthma in Ontario. ICES Investigative Report 2006.

To T, Wajja A, Wales PW, Langer JC: Population demographic indicators associated with indicators of pyloric stenosis. Archives of Pediatrics and Adolescent Medicine 2005: 159: pp 520-5.

To T, Guttmann A, Dick PT, Rosenfield JD, Parkin PC, Cao H, Vydykhan TN, Tassoudji M, Harris JK: Risk markers for poor developmental attainment in young children: results from a longitudinal national survey. Archives of Pediatrics and Adolescent Medicine 2004: 158: pp 643-9.

Rijnsburger AJ, van Oortmarssen GJ, Boer R, Draisma G, To T, Miller AB, de Koning HJ: Mammography benefit in the Canadian National Breast Screening Study - 2: a model evaluation. International Journal of Cancer 2004: 110: pp 756-62.

To T, Vydykhan TN, Dell S, Tassoudji M, Hope JK: Is obesity associated with asthma in young children? Journal of Pediatrics 2004: 144: pp 162-8.

To T, Dell S, Dick P, Cicutto L, Harris JK, Tassoudji M, Duong-Hua M: Burden of childhood asthma. ICES Investigative Report 2004.