Critical appraisal of scientific studies is important because it helps assess the trustworthiness, relevance, and quality of research, allowing researchers and practitioners to make informed decisions based on reliable evidence. It also aids in distinguishing between strong and weak studies, reducing information overload and bias in clinical practice. Each study should be appraised using a critical appraisal tool specific to each study design. For help in deciding which risk of bias / quality assessment tool(s) to use for each study design, consult one of the following sites.