Jadad scale

from Wikipedia, the free encyclopedia

The Jadad scale, also referred to in many publications as the Jadad Score or Oxford Scale , is a simple evaluation scheme (tool) to analyze the quality of clinical intervention studies . The name is derived from Alejandro Jadad (* 1963), a Colombian physician and advocate of evidence-based medicine , who developed this model in Oxford .

meaning

The Jadad scale is currently the only validated scale for assessing the methodological quality of studies. It is used to assess the quality of the conduct of a study and not the quality of the results. However, conclusions about the quality of the results can be drawn from the quality of the study.

construction

The Jadad scale consists of dichotomous questions, the answers to which correlate directly with the quality of the studies. The total of five questions relate to the points:

The questions are in detail:

  1. Was the study described as randomized? ( Yes 1 point, no no point)
  2. Was the randomization appropriate? ( Yes 1 point, No −1 point)
  3. Was the study described as double-blind? ( Yes 1 point, no no point)
  4. Was the blinding appropriate? ( Yes 1 point, No −1 point)
  5. Were the failures ( drop-outs ) justified? ( Yes 1 point, no no point)

The points are then added up. According to Jadad, studies with less than three points are of poor quality. To avoid systematic errors ( bias ), the assessment must be carried out by at least two people.

criticism

Even if the Jadad scale is principally intended to evaluate the quality of the planning and implementation of a study, the quality of the publication is often evaluated. An improperly presented methodology does not have to immediately mean that the study was carried out improperly and vice versa.

When interpreting the Jadad scale, it should also be taken into account that it is only suitable for assessing certain types of study (e.g. therapy studies). For some study types (e.g. cohort studies , case-control studies , diagnostic studies or observational studies ) this scale is not very suitable or not at all.

Individual evidence

  1. ↑ a b P. Kranke, LHJ Eberhardt: Systematic review articles in anesthesia - creation, meaning and interpretation. In: Anaesthesiology & Intensive Care Medicine. 43/2002, pp. 399-410.
  2. ↑ a b R. Kuhlen, R. Rossaint: Evidence-based medicine in anesthesia and intensive care medicine. Springer Verlag, 2005, ISBN 3-540-20042-8 .
  3. ↑ a b Evidence Based Nursing: Jadad Score ( Memento from September 3, 2007 in the Internet Archive )

literature

  • AR Jadad, RA Moore, D. Carroll, C. Jenkinson, DJ Reynolds, DJ Gavaghan, HJ McQuay: Assessing the Quality of Reports of Randomized Clinical Trials: Is Blinding Necessary? In: Control Clin Trials . 17 (1), Feb 1996, pp. 1-12. PMID 8721797 .
  • AR Jadad, RB Haynes, D. Hunt, GP Browman: The internet and evidence-based decision-making: a needed synergy for efficient knowledge management in health care. In: Canadian Medical Association Journal. 162 (3), Feb 8, 2000, pp. 362-365. PMID 10693595 .