Published in BMJ on February 14, 1998
The intracluster correlation coefficient in cluster randomisation. BMJ (1998) 4.07
Sample size calculations for cluster randomised controlled trials with a fixed number of clusters. BMC Med Res Methodol (2011) 2.47
Randomised controlled trials in primary care: case study. BMJ (2000) 2.19
Cluster randomised trials in the medical literature: two bibliometric surveys. BMC Med Res Methodol (2004) 1.98
Internal and external validity of cluster randomised trials: systematic review of recent trials. BMJ (2008) 1.90
Statistical power and validity of Ebola vaccine trials in Sierra Leone: a simulation study of trial design and analysis. Lancet Infect Dis (2015) 1.88
A targeted infection prevention intervention in nursing home residents with indwelling devices: a randomized clinical trial. JAMA Intern Med (2015) 1.79
Focus on function: a cluster, randomized controlled trial comparing child- versus context-focused intervention for young children with cerebral palsy. Dev Med Child Neurol (2011) 1.52
Quantification and MRI validation of regional contractile dysfunction in mice post myocardial infarction using high resolution ultrasound. Ultrasound Med Biol (2007) 1.48
Insurance parity and the use of outpatient mental health care following a psychiatric hospitalization. JAMA (2008) 1.48
A priori postulated and real power in cluster randomized trials: mind the gap. BMC Med Res Methodol (2005) 1.19
Electronic medical record-assisted design of a cluster-randomized trial to improve diabetes care and outcomes. J Gen Intern Med (2008) 1.03
Observed intra-cluster correlation coefficients in a cluster survey sample of patient encounters in general practice in Australia. BMC Med Res Methodol (2004) 1.02
The effect of a brief social intervention on the examination results of UK medical students: a cluster randomised controlled trial. BMC Med Educ (2009) 0.97
Action Plan to enhance self-management and early detection of exacerbations in COPD patients; a multicenter RCT. BMC Pulm Med (2009) 0.91
Effect of an individually tailored one-year energy balance programme on body weight, body composition and lifestyle in recent retirees: a cluster randomised controlled trial. BMC Public Health (2010) 0.86
Prevention through Activity in Kindergarten Trial (PAKT): a cluster randomised controlled trial to assess the effects of an activity intervention in preschool children. BMC Public Health (2010) 0.82
A cluster-randomized controlled trial of a computerized antithrombotic risk assessment tool to optimize stroke prevention in general practice: a study protocol. BMC Health Serv Res (2014) 0.81
Impact of Intensive Handwashing Promotion on Secondary Household Influenza-Like Illness in Rural Bangladesh: Findings from a Randomized Controlled Trial. PLoS One (2015) 0.81
Changing cluster composition in cluster randomised controlled trials: design and analysis considerations. Trials (2014) 0.79
Considerations for the design and analysis of experimental studies in physical activity and exercise promotion: advantages of the randomised controlled trial. Br J Sports Med (2000) 0.77
Implementation of shared decision making by physician training to optimise hypertension treatment. Study protocol of a cluster-RCT. BMC Cardiovasc Disord (2012) 0.77
The Diabetes Telephone Study: Design and Challenges of a Pragmatic Cluster Randomized Trial to Improve Diabetic Peripheral Neuropathy Treatment. Value Health (2015) 0.75
Optimizing Stroke Prevention in Patients With Atrial Fibrillation: A Cluster-Randomized Controlled Trial of a Computerized Antithrombotic Risk Assessment Tool in Australian General Practice, 2012-2013. Prev Chronic Dis (2016) 0.75
A cluster randomised controlled trial of the Climate Schools: Ecstasy and Emerging Drugs Module in Australian secondary schools: study protocol. BMC Public Health (2013) 0.75
Peer led programme for asthma education in adolescents. Issues of design and analysis are crucial in cluster randomised trials. BMJ (2001) 0.75
Baseline hospital performance and the impact of medical emergency teams: modelling vs. conventional subgroup analysis. Trials (2009) 0.75
Elements of statistical treatment of speech and hearing science data. Stammering Res (2005) 0.75
Multifaceted Intervention to Prevent Venous Thromboembolism in Patients Hospitalized for Acute Medical Illness: A Multicenter Cluster-Randomized Trial. PLoS One (2016) 0.75
The CLUES study: a cluster randomized clinical trial for the evaluation of cardiovascular guideline implementation in primary care. BMC Health Serv Res (2013) 0.75
Temporal compliance trends in a cluster randomization with crossover trial of out-of-hospital cardiac arrest. Clin Trials (2012) 0.75
Value of a small control group for estimating intervention effectiveness: results from simulations of immunization effectiveness studies. J Comp Eff Res (2015) 0.75
Evaluation of booking systems for elective surgery using simulation experiments. Healthc Policy (2008) 0.75
Statistical methods for assessing agreement between two methods of clinical measurement. Lancet (1986) 211.50
Diagnostic tests 2: Predictive values. BMJ (1994) 12.97
Diagnostic tests. 1: Sensitivity and specificity. BMJ (1994) 11.35
Absence of evidence is not evidence of absence. BMJ (1995) 10.36
Statistics notes: the normal distribution. BMJ (1995) 6.82
Comparison of clinical information gained from routine blood-gas analysis and from gastric tonometry for intramural pH. Lancet (1993) 5.90
Statistics notes. Treatment allocation in controlled trials: why randomise? BMJ (1999) 5.86
How to randomise. BMJ (1999) 5.24
Air pollution and daily mortality in London: 1987-92. BMJ (1996) 4.97
Comparing several groups using analysis of variance. BMJ (1996) 4.89
Time to event (survival) data. BMJ (1998) 4.29
The natural history of asthma in childhood. J Epidemiol Community Health (1986) 4.09
The intracluster correlation coefficient in cluster randomisation. BMJ (1998) 4.07
Effects on birth weight of smoking, alcohol, caffeine, socioeconomic factors, and psychosocial stress. BMJ (1989) 3.83
The development of respiratory symptoms in a cohort of Kent schoolchildren. Bull Physiopathol Respir (Nancy) (1975) 3.78
Diagnostic tests 3: receiver operating characteristic plots. BMJ (1994) 3.73
Effectiveness of acute postoperative pain management: I. Evidence from published data. Br J Anaesth (2002) 3.60
Surgery on the rheumatoid cervical spine for the non-ambulant myelopathic patient-too much, too late? Lancet (1996) 3.52
Incidence of pregnancy after laparoscopy and hydrotubation. Br Med J (Clin Res Ed) (1982) 3.11
Analysis of a trial randomised in clusters. BMJ (1998) 3.10
Detecting skewness from summary information. BMJ (1996) 2.88
Quartiles, quintiles, centiles, and other quantiles. BMJ (1994) 2.68
Factors associated with the starting of cigarette smoking by primary school children. Br J Prev Soc Med (1974) 2.61
Preterm delivery: effects of socioeconomic factors, psychological stress, smoking, alcohol, and caffeine. BMJ (1995) 2.54
Long-term study of smoking by secondary schoolchildren. Arch Dis Child (1978) 2.54
Randomised controlled trial of effects of coordinating care for terminally ill cancer patients. BMJ (1992) 2.26
Academic performance and social factors related to cigarette smoking by schoolchildren. Br J Prev Soc Med (1977) 2.15
Serum insulin-like growth factor-1 is not a useful marker of prostate cancer. BJU Int (1999) 2.14
A new, minimally invasive technique for measuring cardiac index: clinical comparison of continuous cardiac dynamic monitoring and pulmonary artery catheter methods. Anaesthesia (2009) 2.04
Uteroplacental arterial changes related to interstitial trophoblast migration in early human pregnancy. Placenta (1983) 2.03
Effects of air pollution on daily hospital admissions for respiratory disease in London between 1987-88 and 1991-92. J Epidemiol Community Health (1996) 2.02
Is the clinical trial evidence about new drugs statistically adequate? Br J Clin Pharmacol (1985) 2.01
Smoking and respiratory symptoms in two groups of schoolchildren. Prev Med (1976) 2.01
Health effects of an air pollution episode in London, December 1991. Thorax (1995) 1.98
Ethnic variation in respiratory morbidity and lung function in childhood. Thorax (1987) 1.94
Unequal cluster sizes for trials in English and Welsh general practice: implications for sample size calculations. Stat Med (2001) 1.93
Sex-specific antenatal reference growth charts for uncomplicated singleton pregnancies at 15-40 weeks of gestation. Ultrasound Obstet Gynecol (2004) 1.89
Plasma proinflammatory cytokine concentrations, Acute Physiology and Chronic Health Evaluation (APACHE) III scores and survival in patients in an intensive care unit. Crit Care Med (1996) 1.86
Short-term associations between outdoor air pollution and mortality in London 1992-4. Occup Environ Med (1999) 1.85
Angiotensin-converting enzyme gene deletion polymorphism. A new risk factor for lacunar stroke but not carotid atheroma. Stroke (1995) 1.77
Handedness and longevity: archival study of cricketers. BMJ (1995) 1.76
Statistics notes. Units of analysis. BMJ (1997) 1.70
Air pollution, pollens, and daily admissions for asthma in London 1987-92. Thorax (1998) 1.62
Cough hypersensitivity syndrome: a distinct clinical entity. Lung (2010) 1.61
The effect of anxiety and depression during pregnancy on obstetric complications. Br J Obstet Gynaecol (1993) 1.60
Absence of evidence is not evidence of absence. Aust Vet J (1996) 1.54
Asthma as a link between chest illness in childhood and chronic cough and phlegm in young adults. Br Med J (Clin Res Ed) (1988) 1.51
Short-term associations between emergency hospital admissions for respiratory and cardiovascular disease and outdoor air pollution in London. Arch Environ Health (2000) 1.49
How good is intercenter agreement in the identification of embolic signals in carotid artery disease? Stroke (1996) 1.47
Short-term associations between outdoor air pollution and visits to accident and emergency departments in London for respiratory complaints. Eur Respir J (1999) 1.46
Efficacy of spironolactone on survival in dogs with naturally occurring mitral regurgitation caused by myxomatous mitral valve disease. J Vet Intern Med (2010) 1.45
Fetal biometry at 4300 m compared to sea level in Peru. Ultrasound Obstet Gynecol (2000) 1.45
Factors influencing the presence or absence of acute coronary artery thrombi in sudden ischaemic death. Eur Heart J (1989) 1.41
Late onset microcephaly: failure of prenatal diagnosis. Ultrasound Obstet Gynecol (2003) 1.39
Regression analysis. Lancet (1986) 1.39
Reflections on the recommendations of the EWMA Patient Outcome Group document. J Wound Care (2010) 1.39
Hypomagnesaemia in diabetes. Clin Chim Acta (1979) 1.31
Maternal cotinine level during pregnancy and birthweight for gestational age. Int J Epidemiol (1998) 1.29
Trials which randomize practices II: sample size. Fam Pract (1998) 1.27
VenUS II: a randomised controlled trial of larval therapy in the management of leg ulcers. Health Technol Assess (2009) 1.20
Presentation of numerical data. BMJ (1996) 1.19
Prospective randomized trial of tamoxifen vs surgery in elderly patients with breast cancer. Eur J Surg Oncol (1994) 1.19
Risk factors for readmission to hospital for asthma in childhood. Thorax (1994) 1.18
Gradient ion chromatography of inositol phosphates. Anal Biochem (1988) 1.16
Risk factors for asthma up to 16 years of age. Evidence from a national cohort study. Chest (1987) 1.16
Prevention in practice: results of a 2-year follow-up of routine health promotion interventions in general practice. Fam Pract (1996) 1.15
Prospective randomised trial of tamoxifen versus surgery in elderly patients with breast cancer. Lancet (1988) 1.15
Long-term consequences of respiratory disease in infancy. J Epidemiol Community Health (1978) 1.13
Egg and milk exclusion diets in atopic eczema. Br J Dermatol (1986) 1.10
Development of a functional scoring system for rheumatoid arthritis patients with cervical myelopathy. Ann Rheum Dis (1996) 1.10
The pattern of interstitial trophoblastic invasion of the myometrium in early human pregnancy. Placenta (1982) 1.09
A randomized controlled trial of the cost-effectiveness of a district co-ordinating service for terminally ill cancer patients. Palliat Med (1996) 1.08
Psychological, social and health behaviour risk factors for deaths certified as asthma: a national case-control study. Thorax (2002) 1.06
Anal function: effect of pregnancy and delivery. Am J Obstet Gynecol (2001) 1.06
Polycystic ovaries and associated metabolic abnormalities in Indian subcontinent Asian women. Clin Endocrinol (Oxf) (1998) 1.04
A randomized controlled evaluation of specialist nurse education following accident and emergency department attendance for acute asthma. Respir Med (2000) 1.04
Maternal activity and birth weight: a prospective, population-based study. Am J Epidemiol (1990) 1.03
Effects on birthweight of alcohol and caffeine consumption in smoking women. J Epidemiol Community Health (1991) 1.02
Nutrient intakes during pregnancy: observations on the influence of smoking and social class. Am J Clin Nutr (1990) 1.00
Trials which randomize practices I: how should they be analysed? Fam Pract (1998) 1.00
In defence of logarithmic transformations. Stat Med (2013) 0.99
Primary schoolboys: image of self and smoker. Br J Prev Soc Med (1975) 0.98
The effect of nutritional intake on outcome of pregnancy in smokers and non-smokers. Br J Nutr (1991) 0.98
Relation of caffeine intake and blood caffeine concentrations during pregnancy to fetal growth: prospective population based study. BMJ (1996) 0.98
Comparison of methods of measuring blood pressure. J Epidemiol Community Health (1986) 0.97
Trends in children's smoking. Community Med (1980) 0.97
VenUS III: a randomised controlled trial of therapeutic ultrasound in the management of venous leg ulcers. Health Technol Assess (2011) 0.97
Chest radiography compared to laboratory markers in the detection of alcoholic liver disease. J R Coll Physicians Lond (1983) 0.96
Predictors of outcome in the quadriparetic nonambulatory myelopathic patient with rheumatoid arthritis: a prospective study of 55 surgically treated Ranawat class IIIb patients. J Neurosurg (1996) 0.95
Cigarette smoking and birthweight: type of cigarette smoked and a possible threshold effect. Int J Epidemiol (1991) 0.94
Amino acid supplementation reveals differential regulation of aflatoxin biosynthesis in Aspergillus flavus NRRL 3357 and Aspergillus parasiticus SRRC 143. Appl Microbiol Biotechnol (2007) 0.94
Iturin A: a potential new fungicide for stored grains. Mycopathologia (1994) 0.93
Statistics notes: variables and parameters. BMJ (1999) 0.92
Age-dependent penetrance of different germline mutations in the BRCA1 gene. J Clin Pathol (2009) 0.91
Effect of whooping cough in infancy on subsequent lung function and bronchial reactivity. Am Rev Respir Dis (1986) 0.91
Preclinical left ventricular abnormalities in alcoholics are independent of nutritional status, cirrhosis, and cigarette smoking. Lancet (1985) 0.90
Fungicidal activity of cecropin A. Antimicrob Agents Chemother (1997) 0.90
Social determinants of nutrient intake in smokers and non-smokers during pregnancy. J Epidemiol Community Health (1990) 0.90
The effects of smoking and drinking on the anthropometric measurements of neonates. Paediatr Perinat Epidemiol (1991) 0.87