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. 2006 Aug 8;5:11. doi: 10.1186/1744-859X-5-11

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Copyright © 2006 Arnone et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Demographic Characteristics, Family and Psychiatric History. Difference in age between primary and secondary: (#) not statistically significant difference; (##): χ²= 7.51, df = 26, p > 0.05. Difference in gender in the primaries: (*) χ²alpha = 0.005 df = 1 and (§) χ²= 4.67, df = 1, p > 0.05. Difference in gender in the secondaries: (**) χ²alpha = 0.05 df = 1 and (§§) χ²= 4.67, df = 1, p > 0.05. Difference in family history between primaries and secondaries: (¤)χ²= 0.84, df = 1, p = 0.359. Difference in past psychiatric history between primaries and secondaries: (¶) χ²= 1.67, df = 1, p = 0.196. NS = Not stated.