Table 1

Selection process for papers included in the analysis

Original search of Medline, CINAHL, Embase, PsycINFO, and Cochrane databases from January 1995 to June 2006 to find papers about the effectiveness of collaborativesUpdate: search of Medline database from 2006 to week 2 of June 2009 to find papers about the effectiveness of collaboratives
Potentially relevant articles identified and screened for retrievaln=1104n=263
Articles excluded after abstract review: did not fulfil inclusion criteria or were duplicatesn=929n=202
Retrieved for more detailed evaluationn=175n=61
Excluded after full text search: did not fulfil inclusion criterian=121n= 17 (3 articles were already included in the 1995–2006 search; 1 article was the BMJ review paper)
Articles included that describe the effectiveness of collaborativesn=54n=44
Additional articles identified from reference list searchn=18n=5
English-language articles: data about and descriptions of the effectiveness of collaboratives in a healthcare settingn=72n=49
Articles that also quantitatively assess a relationship between any determinant and any effect parameter of the studyn=10n=13