Evidence source as recommended by the Agency for Health Care Policy Research (AHCPR): | |
Meta-analysis of randomised controlled trials (RCT) | 1a |
One or more RCT | 1b |
One or more controlled trials (without randomisation) | 2a |
Other well designed studies (quasiexperimental) | 2b |
Non-experimental studies (descriptive studies such as comparative or correlation studies, or case-control studies) | 3 |
Expert committee opinions, clinical experience | 4 |
Preliminary recommendations for treatment of psoriatic arthritis (using the best available evidence extracted from published literature): | |
Category 1 evidence | A |
Category 2 evidence, or extrapolation from category 1 evidence | B |
Category 3 evidence, or extrapolation from category 1 or 2 evidence | C |
Category 4 evidence or extrapolation from category 2 or 3 evidence | D |