Chart 2. Levels of evidence (ASHA, 2004) Level Description la Well-designed meta-analysis of more than one randomized controlled trial lb lla llb III IV Well-designed randomized controlled study Well-designed controlled study without randomization Well-designed quasi-experimental study Well-designed non-experimental studies, i.e., correlational and case studies Expert committee report, consensus conference, clinical experience of respected authorities Match the types of study with their ranking level. [Choose ] Level 3 ✓ Level 2 Level 1 Randomized control trial Cohort study Cross-sectional study Case-control study Single subiect design Level 2 Level 3 [Choose ] Ws V
Chart 2. Levels of evidence (ASHA, 2004) Level Description la Well-designed meta-analysis of more than one randomized controlled trial lb lla llb III IV Well-designed randomized controlled study Well-designed controlled study without randomization Well-designed quasi-experimental study Well-designed non-experimental studies, i.e., correlational and case studies Expert committee report, consensus conference, clinical experience of respected authorities Match the types of study with their ranking level. [Choose ] Level 3 ✓ Level 2 Level 1 Randomized control trial Cohort study Cross-sectional study Case-control study Single subiect design Level 2 Level 3 [Choose ] Ws V
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