Low level evidence suggests that librarian-led instruction in evidence based practice is effective regardless of instructional model

Abstract

Objective - To determine both the instructional methods and their effectiveness in teaching evidence based practice (EBP) by librarians in health sciences curricula. Design - Systematic review. Setting - A total of 16 databases, Google Scholar, and MLA Annual Meeting abstracts. Subjects - There were 27 studies identified through a systematic literature search. Methods - An exhaustive list of potential articles was gathered through searching 16 online databases, Google Scholar, and MLA Annual Conference abstracts. Inclusion and exclusion criteria were identified to inform the literature search and determine article eligibility. Duplicates were removed and the remaining search results were divided into sets and assigned to two reviewers who screened first by title/abstract and then by full-text. A third reviewer addressed disagreement in article inclusion. Data extraction, using a validated method described by Koufogiannakis and Wiebe (2006), and critical appraisal, using the Glasgow checklist (1999), were performed concurrently. Main Results - After removal of duplicates 30,043 articles were identified for initial title/abstract screening. Of the 637 articles assessed for full-text screening 26 articles and 1 conference proceeding ultimately met all eligibility criteria. There was no meta-analysis included in the synthesis. There were 16 articles published in library and information science journals and 10 in health sciences journals. Of those studies, 22 were conducted in the United States. A wide range of user groups was identified as participants in the studies with medical students and residents representing the highest percentage and nursing and other allied health professional programs also included. While there was variation in sample size and group allocation, the authors estimate an average of 50 participants per instructional session. Included studies represented research undertaken since the 1990s. All studies addressed at least one of the standard EBP steps including obtaining the best evidence through a literature search (27 studies), developing a clinical question (22 studies), and critical appraisal (12 studies). There were 11 studies which addressed applying evidence to clinical scenarios, and 1 study which addressed the efficacy and efficiency of the EBP process. The majority of studies indicated that literature searching was the primary focus of EBP instruction with MEDLINE being the most utilized database and Cochrane second. Other resources include databases and clinical decision support tools. Teaching methods, including lecture, small group, computer lab, and online instruction, varied amongst the studies. There were 7 studies which employed 1 instructional method while 20 employed a combination of teaching methods. Only one study compared instructional methods and found that students obtained better scores when they received online instruction as compared with face-to-face instruction. The difference, however, was not statistically significant. Skills assessments were conducted in most of the studies utilizing various measurements both validated and not validated. Given the variation in measurement tools a cross-study analysis was not possible. The most common assessment methods included self-reporting and pre- and post-surveys of participants' attitudes and confidence in EBP skills. Randomization was utilized in 10 studies, and an additional 3 studies had a "clearly defined intervention group." There were 10 blinded studies and 15 studies utilized cohorts with pre- and post- intervention assessments. There were 25 studies which included descriptive statistics and many also included inferential statistics intended to show significance. Differences between groups were assessed with parametric measures in 9 studies and non-parametric measures in 15 studies. Good to high statistical significance on at least 1 measurement was achieved in 23 studies. Given the absence of effect sizes, the level of differences between study groups could not be determined. Conclusion - Numerous pedagogical methods are used in librarian-led instruction in evidence based practice. However, there is a paucity of high level evidence and the literature suggests that no instructional method is demonstrated to be more effective than another.