Figure 1.
Monthly rates of suicide based upon all cases of suicide from 1970 to 2001in the Danish Cause of Death Registry. History of mood disorder was obtained from the Danish Psychiatric Central Register. The authors estimated the monthly rate ratio of suicide relative to December. Conditional logistic regression analyses with adjustment for place of residence, marital status, income, and method of suicide were used to compare seasonality of suicide in victims with versus without hospitalization for mood disorders. A statistically significant spring peak in suicide was observed in both groups. A history of mood disorders increased the risk of suicide in spring (for males: RR = 1.18, 95% CI 1.07–1.31; for females: RR = 1.20, 95% CI 1.10–1.32). Reproduced from [19] with permission.