6Untltzer J. Diagnosis and treatment of older adults with depression in primary care[J]. Biol Psychiatry,2002 ;52 (3) :285-92.
7Chan SW, Chiu HF, Chien WT, et al. Quality of life in Chinese elderly people with depression[ J]. Int J Geriatr Psychiatry ,2006 ;21 (4) :312-8.
8Katon WJ, Lin E, Russo J, et al. Increased medical costs of a population- based sample of depressed elderly patients [ J]. Arch Gen Psychiatry, 2003 ;60(9) :897-903.
9Cuijpers P, van Straten A, Oppen P,et al. Are psychological and pharmacologic interventions equally effective in the treatment of adult depressive disorders? A meta-analysisof comparative studies [ J]. J Clin Psychiatry,2008 ;69( 11 ) : 1675-85.
7Zhang L,Xu Y,Nie H,et al.The prevalence of depressive symptoms among the older in China:a meta-analysis[J] .Int J Geriatr Psychiatry,2012,27(9):900-906.
8Pahkala K,Kesti E,Kongas-Saviaro P,et al.Prevalence of depression in an aged population in Finland[J] .Soc Psychiatry Psychiatr Epidemiol,1995,30(3):99-106.
10SPSSX Discussion.Importance of independent variables in Classification Trees (.2006-9-15)[2013-11-22] http://spssx-discussion.1045642.n5.nabble.corm/Importance-of-Indep-vars-in-Classification-trees-td1070942.html.