BMC Public Health 2007, 7:322 http://www.biomedcentral.com/1471-2458/7/322 Additional file 2 Pattern of substance abuse. Pattern of substance abuse in the users of Spe- cial child welfare clinic (SCWC) in Kristiansand, Norway in 1994–2002. N is more than 59 because of polydrug use. Click here for file [http://www.biomedcentral.com/content/supplementary/1471- 2458-7-322-S2.pdf] Additional file 3 Health and socio-economic issues and their relation to substance abuse during pregnancy. Health and socio-economic issues and their relation to substance abuse during pregnancy among the users of SCWC in Kris- tiansand, Norway in 1994–2002. Click here for file [http://www.biomedcentral.com/content/supplementary/1471- 2458-7-322-S3.pdf] Additional file 4 Association between psychosocial variables and the ability to stop sub- stance abuse by the end of the first trimester. Association between psycho- social variables and the ability to stop substance abuse by the end of the first trimester (0 = not stopping, 1 = stop) among the users of SCWC in Kristiansand, Norway, in 1994–2002, from a multivariate logistic regres- sion analysis. Click here for file [http://www.biomedcentral.com/content/supplementary/1471- 2458-7-322-S4.pdf] 1. 2. 3. 4. 5. 6. 7. 8. Acknowledgements The Norwegian Medical Association (NMA) has contributed to this study through Allmennt praktiserende lægers forenings forskningsfond (General Practicioners' Association Research Fund) and Kvalitetssikringsfond II (Quality Assurance Fund II). The project is otherwise financed by the R&D Department at Sørlandet Hospital in Kristiansand. The authors would also like to thank Kaare Danielsen for invaluable help with providing data from the diagnosis register at Sørlandet Hospital, Kristiansand. 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