This study will help in determining national suicide prevention strategies. Moreover, understanding the reasons for the lack of awareness about completed suicide will strengthen the measures to be taken in this regard. It was determined that the most important rate among the causes 48 419 completed suicide in Turkey in the years 2004 to 2019 was the 22 645 (46.76%) suicides of unknown cause and there was not enough information about the underlying causes. Suicide statistics data of the Turkish Statistical Institute (TUIK) between 2004 and 2019 were analyzed retrospectively in terms of geographical regions, gender, age groups and seasonality. Statistical analyses of the study were performed using the Statistical Package for Social Sciences for Windows (IBM SPSS version 25.0, Armonk, NY, USA) software. It was determined that the highest crude rate of suicide during 16 years was in the Eastern Anatolia region, the lowest rate was in the Marmara region, and the ratio of the number of female suicides with unknown cause to the number of male suicides was higher in Eastern Anatolia than in other regions, the rate of unknown crude suicide in both genders was highest in the under 15 age group, this rate decreased as the age progressed, the lowest rate was in women with unknown age, the effect of the season was observed in women with unknown cause, but not in men. Between 2004 and 2019, suicides with unknown cause were the most important reason for suicide. We think that there may be geographical, gender, age, seasonal, sociocultural and economic factors that may affect this, national suicide prevention and planning strategies will be insufficient unless this issue is adequately examined, and institutional structures should be established, including psychiatrists, where deep forensic investigations can be carried out.
Keywords: Turkey; age; completed suicide; season; sex; unknown causes.