A Wilde1, H-N Chan2, B Rahman3, B Meiser4, P B Mitchell5, P R Schofield6, M J Green7. 1. School of Psychiatry, University of New South Wales, NSW 2052, Australia; Black Dog Institute, Sydney, NSW 2031, Australia. Electronic address: alex.wilde@unsw.edu.au. 2. School of Psychiatry, University of New South Wales, NSW 2052, Australia; Black Dog Institute, Sydney, NSW 2031, Australia; Department of Psychiatry, Singapore General Hospital, 169608, Singapore. 3. School of Public Health and Community Medicine, University of New South Wales, NSW 2052, Australia. 4. Prince of Wales Clinical School, University of New South Wales, Sydney, NSW 2052, Australia. 5. School of Psychiatry, University of New South Wales, NSW 2052, Australia; Black Dog Institute, Sydney, NSW 2031, Australia. 6. Neuroscience Research Australia, Sydney, NSW 2031, Australia; School of Medical Sciences, University of New South Wales, NSW 2052, Australia. 7. School of Psychiatry, University of New South Wales, NSW 2052, Australia; Black Dog Institute, Sydney, NSW 2031, Australia; Neuroscience Research Australia, Sydney, NSW 2031, Australia.
Abstract
BACKGROUND: To conduct a meta-analysis to estimate the incidence of major depressive disorder (MDD) and bipolar disorder (BD) in first-degree relatives (FDRs) of probands affected by MDD or BD. The risk for MDD in FDR of BD probands and vice versa is also investigated. METHODS: A systematic review of case-control and cohort studies, which were published between 1977 and 2012; reported relative risks (RR) or odd ratios (OR) or equivalent raw data; made an explicit distinction between MDD and BD; used operational diagnostic criteria; and reported systematic proband recruitment and ascertainment of relatives. Studies were obtained by electronic MEDLINE and EMBASE searches and hand-searching. Estimates were derived from pooled data using random effects methods. RESULTS: Of an initial sample of 241 articles, 22 were eligible for inclusion. For FDRs of one proband with MDD compared to healthy control probands, estimates for MDD were OR=2.14 (95% CI 1.72-2.67), increasing to OR=3.23 (95% CI 2.11-4.94) for two MDD probands. For FDRs of one BD proband compared to healthy control probands, estimates for BD were OR=7.92 (95% CI 2.45-25.61), and OR=6.58 (95% CI 2.64-16.43) for FDRs of two BD probands. CONCLUSIONS: These findings support previously published data indicating strong familiality for both MDD and BD. Data will be useful in providing individuals with a family history of MDD or BPD with tailored risk estimates.
BACKGROUND: To conduct a meta-analysis to estimate the incidence of major depressive disorder (MDD) and bipolar disorder (BD) in first-degree relatives (FDRs) of probands affected by MDD or BD. The risk for MDD in FDR of BD probands and vice versa is also investigated. METHODS: A systematic review of case-control and cohort studies, which were published between 1977 and 2012; reported relative risks (RR) or odd ratios (OR) or equivalent raw data; made an explicit distinction between MDD and BD; used operational diagnostic criteria; and reported systematic proband recruitment and ascertainment of relatives. Studies were obtained by electronic MEDLINE and EMBASE searches and hand-searching. Estimates were derived from pooled data using random effects methods. RESULTS: Of an initial sample of 241 articles, 22 were eligible for inclusion. For FDRs of one proband with MDD compared to healthy control probands, estimates for MDD were OR=2.14 (95% CI 1.72-2.67), increasing to OR=3.23 (95% CI 2.11-4.94) for two MDD probands. For FDRs of one BD proband compared to healthy control probands, estimates for BD were OR=7.92 (95% CI 2.45-25.61), and OR=6.58 (95% CI 2.64-16.43) for FDRs of two BD probands. CONCLUSIONS: These findings support previously published data indicating strong familiality for both MDD and BD. Data will be useful in providing individuals with a family history of MDD or BPD with tailored risk estimates.
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