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Statistics in Medicine, ISSN 0277-6715, 12/2018, Volume 37, Issue 30, pp. 4652 - 4664
Background: A cluster trial with unequal cluster sizes often has lower precision than one with equal clusters, with a corresponding inflation of the design... 
stepped wedge | design effect | cluster randomized trial | unequal cluster sizes | MEDICINE, RESEARCH & EXPERIMENTAL | PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH | RANDOMIZED-TRIALS | MEDICAL INFORMATICS | MATHEMATICAL & COMPUTATIONAL BIOLOGY | STATISTICS & PROBABILITY
Journal Article
BJOG: An International Journal of Obstetrics & Gynaecology, ISSN 1470-0328, 02/2019, Volume 126, Issue 3, pp. 340 - 340
Learning points: Cluster randomised trials are useful for evaluating interventions delivered at the level of the cluster or when there is a risk that... 
Intervention | Clinical trials | Medical research | Bias
Journal Article
Journal Article
BMC Medical Research Methodology, ISSN 1471-2288, 2011, Volume 11, Issue 1, pp. 102 - 102
Background: Cluster randomised controlled trials (CRCTs) are frequently used in health service evaluation. Assuming an average cluster size, required sample... 
MANAGEMENT | HEALTH CARE SCIENCES & SERVICES | Health Services Research - methods | Sample Size | Algorithms | Humans | Research Design | Evaluation Studies as Topic | Cluster Analysis | Randomized Controlled Trials as Topic | Cluster analysis | Clinical trials | Research | Resampling (Statistics)
Journal Article
BMJ : British Medical Journal, ISSN 0959-8138, 2/2014, Volume 348, Issue feb13 1, pp. g1151 - g1151
Objective To investigate change in mental health after smoking cessation compared with continuing to smoke. Design Systematic review and meta-analysis of... 
RESEARCH | DEPRESSION | MEDICINE, GENERAL & INTERNAL | POLICY | ABSTINENCE | SMOKERS | CLINICAL-TRIALS | MECHANISMS | CIGARETTE | ATTITUDES | TOBACCO | Humans | Anxiety - psychology | Depression - psychology | Mental Health | Quality of Life - psychology | Smoking - psychology | Stress, Psychological - psychology | Affect | Smoking Cessation - psychology
Journal Article
Journal of Clinical Epidemiology, ISSN 0895-4356, 2013, Volume 66, Issue 12, pp. 1427 - 1428
  In a cohort design, participants are recruited at the beginning of the study and have repeated measures taken over the different steps. [...]in a... 
Internal Medicine | PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH | HEALTH CARE SCIENCES & SERVICES | Depression - diagnosis | Sample Size | Depression - therapy | Randomized Controlled Trials as Topic - methods | Humans | Studies | Sample size | Efficiency
Journal Article
Statistics in Medicine, ISSN 0277-6715, 06/2016, Volume 35, Issue 13, pp. 2149 - 2166
Journal Article
The Stata Journal, ISSN 1536-867X, 3/2016, Volume 16, Issue 1, pp. 243 - 243
Journal Article
by Peden, Carol and Peden, Carol J and Stephens, Tim and Martin, Michael and Martin, Graham and Kahan, Brennan and Kahan, Brennan C and Thomson, Ann and Rivett, Kate and Wells, Duncan and Wells, John and Richardson, Peter and Richardson, Gerry and Kerry, Sally and Bion, Julian and Pearse, Rupert M and Pearse, Rupert and Brett, Stephen and Ackland, Gareth and Grocott, Mike and Holt, Peter and Robert, Glenn and Ukoumunne, Obioha and Waring, Justin and Everingham, Kirsty and Phull, Mandeep and Cromwell, David and Evley, Rachel and Lilford, Richard and Kocman, David and Asaria, Miqdad and Tarrant, Carolyn and Yang, Fan and Abraham, Ajit and Bothma, Pieter and Conway, Daniel and Stapleton, Clare and Edwards, Jennifer and Edwards, Mark and Minto, Gary and Saunders, David and Owen, Tom and Waldmann, Carl and Hayden, Paul and Gillies, Michael and Tighe, Sean and Smith, Hannah and Smith, Neil and Mythen, Monty and Murray, Therese and Murray, Dave and Murray, Diane and Murray, David and Lobo, Dileep and Leuwer, Martin and Kirk-Bayley, Justin and Howell, Simon and Gordon, Anthony and Anderson, Iain and Lourtie, Jose and Walker, Simon and Drake, Sharon and Watson, Geoff and Watson, Nick and Watson, Nicholas and Watson, Mark and Szakmany, Tamas and Sutcliffe, Robert and Mahajan, Ravi and Girling, Alan and Forbes, Gordon and Faiz, Omar and Blunt, Mark and Singh, Jagdeep and Singh, Satish and Singh, Surjait and Steel, Alistair and Wong, Kate and Cabreros, Leilani and Chitre, Vivek and Obideyi, Ayodele and Ali, Dhiraj and Blenk, Karl and Broad, Dan and Brodbeck, Andreas and Dumpala, Rajesh and Engel, Arnth and Ganepola, Ranjit and Garg, Sudha and Gay, Mike and Karlikowsk, Michael and Lams, Edward and Millican, Dean and Misane, Inga and Mull, Ajaya and Naik, Veena and Pushpa, Nathan and Nutt, Chris and Sagadai, Saravanna and Stuart, Hazel and ... and Enhanced Peri-Operative Care for High-risk patients (EPOCH) trial group
The Lancet, ISSN 0140-6736, 06/2019, Volume 393, Issue 10187, pp. 2213 - 2221
Emergency abdominal surgery is associated with poor patient outcomes. We studied the effectiveness of a national quality improvement (QI) programme to... 
Intervention | Medical personnel | Abdominal surgery | Systemic diseases | Health | Decision making | Health services | Mortality | Health care policy | Critical care | Clinical trials | Emergency medical care | Survival | Patients | Clinical outcomes | Abdomen | Randomization | Hospitals | Motivation | Surgery | Quality control | Clusters | Emergency medical services | Quality of care
Journal Article
Stata Journal, ISSN 1536-867X, 2014, Volume 14, Issue 2, pp. 363 - 380
This article introduces the Stata menu-driven program steppedwedge, which calculates detectable differences and power for stepped-wedge randomized trials. The... 
Sample size | Stepped wedge | st0341 | Cluster-randomized controlled trials | Detectable difference | Steppedwedge | Power | DESIGN | steppedwedge | stepped wedge | SAMPLE-SIZE CALCULATIONS | cluster-randomized controlled trials | detectable difference | STATISTICS & PROBABILITY | SOCIAL SCIENCES, MATHEMATICAL METHODS | power | sample size | Cluster analysis | Methods
Journal Article
BJOG : an international journal of obstetrics and gynaecology, ISSN 1470-0328, 02/2019, Volume 126, Issue 3, pp. 340 - 340
Journal Article
BMC MEDICAL RESEARCH METHODOLOGY, ISSN 1471-2288, 06/2019, Volume 19, Issue 1, pp. 123 - 11
BackgroundCluster randomised trials with unequal sized clusters often have lower precision than with clusters of equal size. To allow for this, sample sizes... 
DESIGN | Cluster randomised trials | Varying cluster size | HEALTH CARE SCIENCES & SERVICES | Stepped-wedge | SAMPLE-SIZE | EFFICIENCY | Cluster analysis | Medical research | Efficiency | Research methodology | Clinical trials | Systematic review | Patient satisfaction | Primary care
Journal Article
BMJ Open, ISSN 2044-6055, 02/2016, Volume 6, Issue 2, p. e010166
BackgroundStepped-wedge cluster randomised trials (SW-CRT) are increasingly being used in health policy and services research, but unless they are conducted... 
MEDICINE, GENERAL & INTERNAL | DESIGN | IMPACT | QUALITY | CONSORT STATEMENT | SMALLER | GUIDELINES | IMPLEMENTATION | EXTENSION | EFFICIENCY | PARALLEL | Randomized Controlled Trials as Topic - statistics & numerical data | Sample Size | Humans | Research Report | Health Policy | Research Design | Cluster Analysis
Journal Article