The journal impact factor as a predictor of trial quality and outcomes: Cohort study of hepatobiliary randomized clinical trials

American Journal of Gastroenterology

Volumn 100, Issue 11, 2005, Pages 2431-2435

  Gluud, Lise L ^a   Sørensen, Thorkild I A ^b   Gøtzsche, Peter C ^a   Gluud, Christian ^a  

^a Rigshospitalet   (Denmark)

^b The Capital Region   (Denmark)

Author keywords

[No Author keywords available]

Indexed keywords

ALCOHOL LIVER CIRRHOSIS; ARTICLE; AUTOIMMUNE DISEASE; CLINICAL TRIAL; COHORT ANALYSIS; CONTROLLED CLINICAL TRIAL; GALLSTONE; HEPATIC ENCEPHALOPATHY; HEPATITIS; HEPATOBILIARY SYSTEM; LIVER CELL CARCINOMA; LIVER CIRRHOSIS; LIVER FAILURE; MEDICAL LITERATURE; OUTCOME ASSESSMENT; PORTAL HYPERTENSION; PRIMARY BILIARY CIRRHOSIS; PRIORITY JOURNAL; PUBLICATION; QUALITY CONTROL; RANDOMIZED CONTROLLED TRIAL; BIBLIOMETRICS; BILIARY TRACT DISEASE; HUMAN; LIVER DISEASE; METHODOLOGY; NONPARAMETRIC TEST; PATIENT SELECTION; RANDOMIZATION; SAMPLE SIZE; STANDARD; STATISTICAL ANALYSIS; TREATMENT OUTCOME;

BIBLIOMETRICS; BILIARY TRACT DISEASES; COHORT STUDIES; DATA INTERPRETATION, STATISTICAL; HUMANS; LIVER DISEASES; PATIENT SELECTION; PERIODICALS; RANDOM ALLOCATION; RANDOMIZED CONTROLLED TRIALS; RESEARCH DESIGN; SAMPLE SIZE; STATISTICS, NONPARAMETRIC; TREATMENT OUTCOME;

EID: 33644637053     PISSN: 00029270     EISSN: 15720241     Source Type: Journal    
DOI: 10.1111/j.1572-0241.2005.00327.x     Document Type: Article

References (16)

1. Sackett D Rosenberg WM Gray JA, et al. Evidence based medicine: What it is and what it isn't. BMJ 1996 312 : 71 2.
2. Gluud C Nikolova D. Quality assessment of reports on clinical trials in the Journal of Hepatology. J Hepatol 1998 29 : 321 7.
3. Kjaergard LL Nikolova D Gluud C. Randomized clinical trials in Hepatology: Predictors of quality. Hepatology 1999 30 : 1134 8.
4. Kjaergard LL Frederiksen SL Gluud C. Validity of randomized clinical trials in Gastroenterology from 1964 to 2000. Gastroenterology 2002 122 : 1157 60.
5. Kjaergard LL Gluud C. Funding, disease area, and internal validity of hepatobiliary randomized clinical trials. Am J Gastroenterol 2002 97 : 2708 13.
6. Opthof T. Sense and nonsense about the impact factor. Cardiovasc Res 1997 33 : 1 7.
7. Easterbrook PJ Berlin JA Gopalan R, et al. Publication bias in clinical research. Lancet 1991 337 : 867 72.
8. Kjaergard LL Gluud C. Citation bias of hepato-biliary randomized clinical trials. J Clin Epidemiol 2002 55 : 407 10.
9. Peto R Baigent C. Trials: The next 50 years. Large scale randomised evidence of moderate benefits. BMJ 1998 317 : 1170 1.
10. Moher D Pham B Jones A, et al. Does quality of reports of randomised trials affect estimates of intervention efficacy reported in meta-analyses? Lancet 1998 352 : 609 13.
11. Kjaergard LL Villumsen J Gluud C. Reported methodologic quality and discrepancies between large and small randomized trials in meta-analyses. Ann Intern Med 2001 135 : 982 9.
12. Jüni P Altman DG Egger M. Assessing the quality of controlled clinical trials. BMJ 2001 323 : 42 6.
13. Schulz KF Chalmers I Hayes RJ, et al. Empirical evidence of bias. Dimensions of methodological quality associated with estimates of treatment effects in controlled trials. JAMA 1995 273 : 408 12.
14. Pocock SJ Hughes MD Lee RJ. Statistical problems in the reporting of clinical trials. A survey of three medical journals. New Engl J Med 1987 317 : 426 32.
15. Egger M Jüni P Bartlett C, et al. How important are comprehensive literature searches and the assessment of trial quality in systematic reviews? Empirical study. Health Technol Assess 2003 7 : 1 76.
16. Altman DG Schulz KF. Concealing treatment allocation in randomised trials. BMJ 2001 323 : 446 7.