In accordance with the National Kidney Foundation/Dialysis Outcomes Quality Initiative (NKF/DOQI) classification system, these patients were classified into stages 1, 2, 3, 4, or 5 for descriptive purposes.
The methodological quality was evaluated by a classification system, which has previously been used in reviews on new health technology and medical procedures in health care (Table 3).
For that reason, the Acute Dialysis Quality Initiative group proposed a classification system for use in critically ill adult patients, termed the RIFLE criteria [ 9].
Detailed information on data management, quality assurance and classification systems is given in ESM 4.
The novel method described here offers a systematic framework to address the quality of protein classification systems.
Obtaining high-quality data will require consistent definitions for stillbirths, systematic population-based registration, better tools for surveys and verbal autopsies, capacity building and training in procedures to identify causes of death, locally adapted quality indicators, improved classification systems, and effective registration and reporting systems.
France has a national standardized classification system for air quality monitoring stations.
In 2004, the Acute Dialysis Quality Initiative (ADQI) proposed an AKI classification system called "Risk, Injury, Failure, Loss, End-Stage Kidney Disease (RIFLE)" criteria to promote a consistent and consensus AKI definition [ 9].
Indeed, this classification system attributes the quality mainly according to the study design; therefore, only RCTs or systematic reviews of RCTs, which have not been performed in focal therapy, are classified at higher levels of evidence.
Accordingly, we developed a classification system to grade the quality of scientific evidence supporting ADA recommendations for all new and revised ADA position statements.
