User profiles for David J. Torgerson

David Torgerson

York Trials Unit, Department of Health Sciences, University of York
Verified email at york.ac.uk
Cited by 42053

Understanding controlled trials: What are pragmatic trials?

M Roland, DJ Torgerson - Bmj, 1998 - bmj.com
Trials of healthcare interventions are often described as either explanatory or pragmatic.
Explanatory trials generally measure efficacy-the benefit a treatment produces under ideal …

Hormone replacement therapy and prevention of nonvertebral fractures: a meta-analysis of randomized trials

DJ Torgerson, SEM Bell-Syer - Jama, 2001 - jamanetwork.com
ContextHormone replacement therapy (HRT) is widely considered to reduce fractures, but
this belief is based on observational data; evidence from randomized trials is lacking.…

Randomised controlled trial of calcium and supplementation with cholecalciferol (vitamin D3) for prevention of fractures in primary care

…, C Iglesias, S Puffer, A Sutcliffe, I Watt, DJ Torgerson - Bmj, 2005 - bmj.com
Objective To assess whether supplementation with calcium and cholecaliferol (vitamin D 3 )
reduces the risk of fracture in women with one or more risk factors for fracture of the hip. …

Contamination in trials: is cluster randomisation the answer?

DJ Torgerson - Bmj, 2001 - bmj.com
Most randomised trials allocate individual participants to different treatments. However,
cluster randomised trials in which groups of subjects are allocated to different treatments are …

Vitamin K and the prevention of fractures: systematic review and meta-analysis of randomized controlled trials

…, MJ Shearer, S Gilbody, DJ Torgerson - Archives of internal …, 2006 - jamanetwork.com
Background Observational and some experimental data suggest that low intake of vitamin K
may be associated with an increased risk of fracture. Objective To assess whether oral …

Reporting attrition in randomised controlled trials

JC Dumville, DJ Torgerson, CE Hewitt - Bmj, 2006 - bmj.com
Loss to follow-up can greatly affect the strength of a trial's findings. But most reports do not
give readers enough information for them to be able to understand the potential effects

Definitions of efficiency

S Palmer, DJ Torgerson - Bmj, 1999 - bmj.com
Decision makers are increasingly faced with the challenge of reconciling growing demand
for health care services with available funds. 1 Economists argue that the achievement of (…

Should we pay the patient? Review of financial incentives to enhance patient compliance

A Giuffrida, DJ Torgerson - Bmj, 1997 - bmj.com
Objective: To determine whether financial incentives increase patients' compliance with
healthcare treatments. Data sources: Systematic literature review of computer databases—…

Systematic review of stepped wedge cluster randomized trials shows that design is particularly used to evaluate interventions during routine implementation

…, MS Man, CA Taylor, DJ Torgerson - Journal of clinical …, 2011 - Elsevier
OBJECTIVE: To describe the application of the stepped wedge cluster randomized controlled
trial (CRCT) design. STUDY DESIGN AND SETTING: Systematic review. We searched …

Cost of illness studies

S Byford, DJ Torgerson, J Raftery - Bmj, 2000 - bmj.com
Cost of illness studies are a type of economic study common in the medical literature,
particularly in specialist clinical journals. The aim of a cost of illness study is to identify and …