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Codes with uncertainty about intention (Y10–Y34) were included, primarily in order to limit temporal and regional variation in ascertainment routines. [15], [16] Suicide attempt was measured in two separate periods for each cohort: for the five years following the year the cohort was defined (e.g., from 1 January 2006 to 31 December 2010 for the cohort of 2005), and anytime before the baseline.
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