Premium
Randomized clinical trials in Hepatology : Predictors of quality
Author(s) -
Kjaergard Lise Lotte,
Nikolova Dimitrinka,
Gluud Christian
Publication year - 1999
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.510300510
Subject(s) - medicine , blinding , hepatology , randomized controlled trial , quality score , clinical trial , odds , logistic regression , quality (philosophy) , odds ratio , operations management , metric (unit) , philosophy , epistemology , economics
Abstract Evidence shows that the quality of randomized clinical trials (RCTs) affects estimates of intervention efficacy, which is significantly exaggerated in low‐quality trials. The present study examines the quality of all 235 RCTs published in Hepatology from the initiation in 1981 through August 1998. Quality was assessed by means of a validated 5‐point scale and separate quality components associated with empirical evidence of bias. Only 26% of all RCTs reported sample size calculations, 52% adequate generation of the allocation sequence, 34% adequate allocation concealment and 34% double‐blinding. The median quality score of all trials was 3 points (range, 1‐5 points). Multiple logistic regression analysis explored the association between quality and therapeutic areas, number of centers, external funding, year of publication, and country of origin. High‐quality trials were most likely to investigate portal hypertension (odds ratio [OR]: 2.4; 95% CI: 1.1‐5.5; P = .03), be multicentered (OR: 3.4; 95% CI: 1.3‐8.9; P = .01), sponsored by public organizations (OR: 4.2; 95% CI: 2.1‐8.6; P = .0001), or the drug and device industry (OR: 4.7; 95% CI: 2.2‐10.2; P = .0001) compared with other therapeutic areas, single‐center trials, and trials with no external funding. Quality did not improve with time and was not associated with country of origin. The main conclusions are that the quality of RCTs in Hepatology needs improvement and that the probability of high quality increased with the number of centers involved and external funding.