VII. Statistical Issues
A. Sample Size
To detect an effect with a power of 0.95 at a 0.05 level of significance, given the size of the study population, a sample size of 385 participants would be required. Given the sampling techniques which were discussed earlier the study will therefore aim to sample at least 250 past or present inpatients of the psychiatric unit and 250 control participants. This will account for rejection of participation by 25% of those approached to participate.
B. Approach to Analysis
Chi-squared tests will be used to determine whether there are different rates of discharge for mental health between the different groups identified. Chi-squared testing and other non-parametric tests will also be used to test whether other demographic and health factors have any impact on discharge differences between the sample and control groups.
References
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Brosschot, J.F., Pieper, S. & Thayer, J.F. (2005). Expanding stress theory: Prolonged activation and preservative cognition. Psychoneuroendocrinology, 30(10): 1043-1049.
Elonheimo, H., Niemla, S., Parkkola, K., Multimaki, P., Helenius, H., Nuutila, a.-M. & Sourander, a. (2007). Police-registered offenses and psychiatric disorders among young males. Social Psychiatry and Psychiatric Epidemiology, 42(6): 477-484.
Hoge, C.W., Castro, C.A., Messer, S.C., McGurk, D., Cotting, D.I. & Koffman, R.L. (2004). Combat duty in Iraq and Afghanistan, mental health problems, and barriers to care. The New England Journal of Medicine, 351: 13-22.
Hoge, C.W., Auchterlonie,...
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