Study Population
All individuals born in Denmark between January 1, 1945, and December 31, 1996, and who were alive during the study period were included in our analyses. We conducted a cohort study that followed a total of 3,567,573 persons from the first day of 1977 until onset of the disorders of interest, death, emigration from Denmark, or the last day of 2006, whichever came first. During the study period (from 1977 to 2006), complete information on these individuals was available from the national registers. Information pertaining to autoimmune diseases and infections in individuals in this cohort was obtained from the Danish National Hospital Register. Cohort members were linked with the Danish Psychiatric Central Register and followed from their 10th birthday to establish whether they received a diagnosis of a schizophrenia spectrum disorder.
Study PopulationAll individuals born in Denmark between January 1, 1945, and December 31, 1996, and who were alive during the study period were included in our analyses. We conducted a cohort study that followed a total of 3,567,573 persons from the first day of 1977 until onset of the disorders of interest, death, emigration from Denmark, or the last day of 2006, whichever came first. During the study period (from 1977 to 2006), complete information on these individuals was available from the national registers. Information pertaining to autoimmune diseases and infections in individuals in this cohort was obtained from the Danish National Hospital Register. Cohort members were linked with the Danish Psychiatric Central Register and followed from their 10th birthday to establish whether they received a diagnosis of a schizophrenia spectrum disorder.
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