|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
|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
|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
|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
|Validity of information on comorbidity derived from ICD-9-CCM administrative data|
H Quan, GA Parsons, WA Ghali
Medical care, 675-685, 2002
|Comparison of the Elixhauser and Charlson/Deyo methods of comorbidity measurement in administrative data|
DA Southern, H Quan, WA Ghali
Medical care, 355-360, 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
|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
|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
|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
|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
|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
|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
|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
|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
|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
|Incidence of primary sclerosing cholangitis: a systematic review and meta‐analysis|
NA Molodecky, H Kareemi, R Parab, HW Barkema, H Quan, RP Myers, ...
Hepatology 53 (5), 1590-1599, 2011
|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
|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
|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