| Coding algorithms for defining comorbidities in ICD-9-CM and ICD-10 administrative data H Quan, V Sundararajan, P Halfon, A Fong, B Burnand, JC Luthi, ... Medical care, 1130-1139, 2005 | 4434 | 2005 |
| Updating and validating the Charlson comorbidity index and score for risk adjustment in hospital discharge abstracts using data from 6 countries H Quan, B Li, CM Couris, K Fushimi, P Graham, P Hider, JM Januel, ... American journal of epidemiology 173 (6), 676-682, 2011 | 1349 | 2011 |
| New ICD-10 version of the Charlson comorbidity index predicted in-hospital mortality V Sundararajan, T Henderson, C Perry, A Muggivan, H Quan, WA Ghali Journal of clinical epidemiology 57 (12), 1288-1294, 2004 | 1022 | 2004 |
| A modification of the Elixhauser comorbidity measures into a point system for hospital death using administrative data C van Walraven, PC Austin, A Jennings, H Quan, AJ Forster Medical care, 626-633, 2009 | 671 | 2009 |
| Validity of information on comorbidity derived from ICD-9-CCM administrative data H Quan, GA Parsons, WA Ghali Medical care, 675-685, 2002 | 580 | 2002 |
| Comparison of the Elixhauser and Charlson/Deyo methods of comorbidity measurement in administrative data DA Southern, H Quan, WA Ghali Medical care 42 (4), 355-360, 2004 | 498 | 2004 |
| Dealing with missing data in a multi-question depression scale: a comparison of imputation methods FM Shrive, H Stuart, H Quan, WA Ghali BMC medical research methodology 6 (1), 57, 2006 | 463 | 2006 |
| Assessing validity of ICD‐9‐CM and ICD‐10 administrative data in recording clinical conditions in a unique dually coded database H Quan, B Li, L Duncan Saunders, GA Parsons, CI Nilsson, A Alibhai, ... Health services research 43 (4), 1424-1441, 2008 | 453 | 2008 |
| Adapting the Charlson Comorbidity Index for use in patients with ESRD BR Hemmelgarn, BJ Manns, H Quan, WA Ghali American Journal of Kidney Diseases 42 (1), 125-132, 2003 | 338 | 2003 |
| Validity of procedure codes in International Classification of Diseases, 9th revision, clinical modification administrative data H Quan, GA Parsons, WA Ghali Medical care, 801-809, 2004 | 323 | 2004 |
| Exploring physician specialist response rates to web-based surveys CT Cunningham, H Quan, B Hemmelgarn, T Noseworthy, CA Beck, ... BMC medical research methodology 15 (1), 32, 2015 | 281 | 2015 |
| Physician interpretations and textbook definitions of blinding terminology in randomized controlled trials PJ Devereaux, BJ Manns, WA Ghali, H Quan, C Lacchetti, VM Montori, ... Jama 285 (15), 2000-2003, 2001 | 257 | 2001 |
| Risk adjustment performance of Charlson and Elixhauser comorbidities in ICD-9 and ICD-10 administrative databases B Li, D Evans, P Faris, S Dean, H Quan BMC health services research 8 (1), 12, 2008 | 235 | 2008 |
| Comparison of 2 methods for calculating adjusted survival curves from proportional hazards models WA Ghali, H Quan, R Brant, G van Melle, CM Norris, PD Faris, ... Jama 286 (12), 1494-1497, 2001 | 232 | 2001 |
| Symptomatic in-hospital deep vein thrombosis and pulmonary embolism following hip and knee arthroplasty among patients receiving recommended prophylaxis: a systematic review JM Januel, G Chen, C Ruffieux, H Quan, JD Douketis, MA Crowther, ... Jama 307 (3), 294-303, 2012 | 218 | 2012 |
| Statins are associated with better outcomes after carotid endarterectomy in symptomatic patients J Kennedy, H Quan, AM Buchan, WA Ghali, TE Feasby Stroke 36 (10), 2072-2076, 2005 | 205 | 2005 |
| The impact of the electronic medical record on structure, process, and outcomes within primary care: a systematic review of the evidence JM Holroyd-Leduc, D Lorenzetti, SE Straus, L Sykes, H Quan Journal of the American Medical Informatics Association 18 (6), 732-737, 2011 | 202 | 2011 |
| Reliability and validity of the international physical activity questionnaire in the Nord-Trøndelag health study (HUNT) population of men N Kurtze, V Rangul, BE Hustvedt BMC medical research methodology 8 (1), 63, 2008 | 200 | 2008 |
| Validation of a case definition to define hypertension using administrative data H Quan, N Khan, BR Hemmelgarn, K Tu, G Chen, N Campbell, MD Hill, ... Hypertension 54 (6), 1423-1428, 2009 | 199 | 2009 |
| Diagnosed hypertension in Canada: incidence, prevalence and associated mortality C Robitaille, S Dai, C Waters, L Loukine, C Bancej, S Quach, J Ellison, ... cmaj 184 (1), E49-E56, 2012 | 191 | 2012 |
