Analysis of completed suicides seasonality in relation to such external factors as length of the day and ambient temperature

Aim of the Study. To characterize suicide seasonality in the Odessa region, to estimate the relation of this phenomenon to day length and ambient temperature. Methods. The research is based on the analysis of 11220 cases of completed suicides in the city of Odessa and Odessa region in 2000-2016. Initial data are presented by the Odessa Regional Forensic Bureau. All data were processed statistically, previously being reduced to a single scale, taking into account the different number of days in the months of the year. To study the statistical hypothesis about the equality of the proportions of suicides per month of the year, a binomial criterion with a two-sided critical region was used. Results. Suicides in Odessa region grow from March to August, the maximum is seen in May-June, while the minimum can be observed in December-February. Seasonality pattern in Odessa region is rather strongly marked. Thus, an average number of suicides in May for 58% exceeds that in December...