Table 1

Major databases and specialist registers searched

Time period of searchDate searched
Major commercial databases
PubMed (includes Medline and old Medline)January 1950-June 2004June 2004
EmbaseJanuary 1981-June 2004June 2004
Cumulative Index to Nursing and Allied Health Literature (CINAHL)January 1982-May 2004May 2004
Education Resources Information Center (ERIC)January 1985-April 2004April 2004
Sociological Abstracts (SocAbs)January 1981-May 2004May 2004
Applied Social Sciences Index and Abstracts (ASSIA)January 1987-May 2004May 2004
PsycINFOJanuary 1988-May 2004May 2004
Specialist registers
Evidence for Policy and Practice Information Centre Register of Health Promotion and Public Health Research (BiblioMap)All years available April 2004
Cochrane Central Register of Controlled Trials (CENTRAL)All years available May 2004
National Research Register (NRR)All years availableMarch 2004
Health Promotion Library for Scotland (HPLS)All years availableMarch 2004
Health Development Agency Register (Health Promis)All years availableApril 2004

All sources searched were used to identify both quantitative and qualitative studies.