Table 1, Chapter 35Study design distribution

Study DesignDescriptionNumber of Studies*
Randomized, controlled trial (RCT)A standard randomized controlled trial involving two groups; a control and the intervention group.14
Experimental DesignStudy with a concurrent usual care control group, or another method for controlling and comparing between experimental and usual care non-experimental groups (but not including the pre/post method)12
Pre/PostA before and after study comparing pre-intervention to post-intervention results.16
OtherEvaluative studies not matching the aforementioned designs.58

Number of studies adds to more than 95 because several had multiple designs.

From: Chapter 35, Patient Safety Practices Targeted at Diagnostic Errors (NEW)

Cover of Making Health Care Safer II
Making Health Care Safer II: An Updated Critical Analysis of the Evidence for Patient Safety Practices.
Evidence Reports/Technology Assessments, No. 211.

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