Laura Hiltunen1, Jari Haukka, Reija Ruuhela, Kirsi Suominen, Timo Partonen. 1. Department of Mental Health and Substance Abuse Services, National Institute for Health and Welfare, Mannerheimintie 166, P.O. Box 30, 00271, Helsinki, Finland, laura.hiltunen@thl.fi.
Abstract
OBJECTIVES: Suicide peaks in late spring and October are still seen in Finland among many countries. Weather factors have been suggested as explanations for these peaks, although with inconsistent results. Since the exact timing of these peaks varies each year, the length of daylight and changes in it seem inadequate as an explanation. We hypothesized that ambient temperature and the timing of thermal seasons might associate with suicide rate. METHODS: Suicide rates from three areas across Finland (N = 10,802) were analyzed with Poisson regression in six different models against variables calculated from the local ambient daily temperature, diurnal temperature range, and the duration from the onset of thermal seasons. Separate models for men and women were constructed. RESULTS: The temperature change over 5 days associated with the suicide rate of men in Helsinki region, or in other words, the lower the suicide rate was, the higher the temperature decrease had been. For women, the results were more inconsistent. CONCLUSIONS: Our study is in line with some earlier studies which imply that impairment of thermoregulation might exist among suicide victims.
OBJECTIVES: Suicide peaks in late spring and October are still seen in Finland among many countries. Weather factors have been suggested as explanations for these peaks, although with inconsistent results. Since the exact timing of these peaks varies each year, the length of daylight and changes in it seem inadequate as an explanation. We hypothesized that ambient temperature and the timing of thermal seasons might associate with suicide rate. METHODS: Suicide rates from three areas across Finland (N = 10,802) were analyzed with Poisson regression in six different models against variables calculated from the local ambient daily temperature, diurnal temperature range, and the duration from the onset of thermal seasons. Separate models for men and women were constructed. RESULTS: The temperature change over 5 days associated with the suicide rate of men in Helsinki region, or in other words, the lower the suicide rate was, the higher the temperature decrease had been. For women, the results were more inconsistent. CONCLUSIONS: Our study is in line with some earlier studies which imply that impairment of thermoregulation might exist among suicide victims.
Authors: Maija Ylivuori; Reija Ruuhela; Harri Sintonen; Paula Virkkula; Risto P Roine; Maija Hytönen Journal: Int J Environ Res Public Health Date: 2021-06-14 Impact factor: 3.390
Authors: Pui Hing Chau; Paul Siu Fai Yip; Ho Yin Eric Lau; Yee Ting Ip; Frances Yik Wa Law; Rainbow Tin Hung Ho; Angela Yee Man Leung; Janet Yuen Ha Wong; Jean Woo Journal: Int J Environ Res Public Health Date: 2020-05-15 Impact factor: 3.390