Why are the causal effects of shared environment

Why are the causal effects of shared environment
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Why are the causal effects of shared environment so small? Paul Lichtenstein, professor Head of department Department of Medical Epidemiology and Biostatistics Karolinska Institutet, Sweden Outline The question: Why do we care about shared

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Why are the causal effects of shared environment so small? Paul Lichtenstein, professor
Head of department
Department of Medical Epidemiology and Biostatistics Karolinska Institutet, Sweden<br>
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Outline The question: Why do we care about shared environment

The method: Twin and family methods

The empirical results: Very little shared environment for psychiatric phenotypes

The meaning: How should we interpret the limited effect of the shared environment?

The conclusion: Life is unfair – should we bother?<br>
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Familial aggregation Lichtenstein et al, 2009, Lancet WHY??
Genes?
Environments?<br>