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Comment & Response
July 2015

Testing the Penrose Hypothesis—Reply

Author Affiliations
  • 1Unit of Social and Community Psychiatry, World Health Organization Collaborating Centre for Mental Health Services Development, Queen Mary University of London, London, England
  • 2Escuela de Medicina sede Puerto Montt, Universidad San Sebastián, Puerto Montt, Chile
JAMA Psychiatry. 2015;72(7):736. doi:10.1001/jamapsychiatry.2015.0217

In Reply We thank Tsai and Venkataramani for their comments, which raise important methodological issues and challenge the findings presented in our article.1 They reconstructed the data set and stated that the association found between psychiatric bed numbers and prison populations disappears once they adjusted for year fixed effects or linear time trends.

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