A protective role of urban greenspace on the association between night-time heat and suicide in Seoul, South Korea
Suicide, a leading cause of death among the youth, has shown a positive association with high temperatures. However, few studies have explored the association between tropical nights and suicide and the potential role of greenness on this association. We investigated the association between suicide...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | Environmental Research: Health |
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| Online Access: | https://doi.org/10.1088/2752-5309/ad1c42 |
| _version_ | 1797353371928100864 |
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| author | Jinah Park Jeongmin Moon Dohoon Kwon John S Ji Ho Kim Yoonhee Kim |
| author_facet | Jinah Park Jeongmin Moon Dohoon Kwon John S Ji Ho Kim Yoonhee Kim |
| author_sort | Jinah Park |
| collection | DOAJ |
| description | Suicide, a leading cause of death among the youth, has shown a positive association with high temperatures. However, few studies have explored the association between tropical nights and suicide and the potential role of greenness on this association. We investigated the association between suicide and two hot night indices: hot night duration (HNd) and hot night excess (HNe), representing heat duration and excess heat during night-time. We also explored whether the association was modified by urban greenspace, measured by satellite-derived normalized difference vegetation index (NDVI), across 25 districts in Seoul, South Korea from 2000 to 2020. Based on the multi-district daily time-series data, we performed a space-time-stratified case-crossover analysis with a distributed lag linear model with lags of up to 7 d for HNd and HNe, adjusting for daily mean temperature and relative humidity. We added an interaction term between the hot night index and NDVI to assess the effect modification of greenness. In total, 14 693 suicides were included in this study. The relative risk (RR) of suicide per a 10% increase in HNd was 1.059 (95% CI: 1.017–1.103) in low NDVI areas and 1.031 (95% CI: 0.988–1.075) in high NDVI areas. The RR per a 1 °C increase in HNe was 1.011 (95% CI: 0.998–1.024) and 1.005 (95% CI: 0.992–1.018) in low and high NDVI areas, respectively. Greenspaces have expanded over time in all districts of Seoul, and the risk of suicide for night-time heat decreased over time in both low and high NDVI areas. Our findings suggest that exposure to night-time heat is associated with an increased risk of suicide, but this risk may be mitigated by greater greenspaces in urban areas. Prioritizing development and maintenance of urban greenspaces will be a critical co-benefit strategy for promoting public mental health in changing climates. |
| first_indexed | 2024-03-08T13:30:06Z |
| format | Article |
| id | doaj.art-27cb9d53f6f94969845dbbc51bf9e787 |
| institution | Directory Open Access Journal |
| issn | 2752-5309 |
| language | English |
| last_indexed | 2024-03-08T13:30:06Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research: Health |
| spelling | doaj.art-27cb9d53f6f94969845dbbc51bf9e7872024-01-17T09:47:22ZengIOP PublishingEnvironmental Research: Health2752-53092024-01-012101500510.1088/2752-5309/ad1c42A protective role of urban greenspace on the association between night-time heat and suicide in Seoul, South KoreaJinah Park0Jeongmin Moon1Dohoon Kwon2John S Ji3https://orcid.org/0000-0002-5002-118XHo Kim4Yoonhee Kim5https://orcid.org/0000-0003-2517-1087Department of Public Health Sciences, Graduate School of Public Health, Seoul National University , Seoul, Republic of KoreaDepartment of Public Health Sciences, Graduate School of Public Health, Seoul National University , Seoul, Republic of KoreaDepartment of Public Health Sciences, Graduate School of Public Health, Seoul National University , Seoul, Republic of KoreaVanke School of Public Health, Tsinghua University , Beijing, People’s Republic of ChinaDepartment of Public Health Sciences, Graduate School of Public Health, Seoul National University , Seoul, Republic of KoreaDepartment of Global Environmental Health, Graduate School of Medicine, University of Tokyo , Tokyo, JapanSuicide, a leading cause of death among the youth, has shown a positive association with high temperatures. However, few studies have explored the association between tropical nights and suicide and the potential role of greenness on this association. We investigated the association between suicide and two hot night indices: hot night duration (HNd) and hot night excess (HNe), representing heat duration and excess heat during night-time. We also explored whether the association was modified by urban greenspace, measured by satellite-derived normalized difference vegetation index (NDVI), across 25 districts in Seoul, South Korea from 2000 to 2020. Based on the multi-district daily time-series data, we performed a space-time-stratified case-crossover analysis with a distributed lag linear model with lags of up to 7 d for HNd and HNe, adjusting for daily mean temperature and relative humidity. We added an interaction term between the hot night index and NDVI to assess the effect modification of greenness. In total, 14 693 suicides were included in this study. The relative risk (RR) of suicide per a 10% increase in HNd was 1.059 (95% CI: 1.017–1.103) in low NDVI areas and 1.031 (95% CI: 0.988–1.075) in high NDVI areas. The RR per a 1 °C increase in HNe was 1.011 (95% CI: 0.998–1.024) and 1.005 (95% CI: 0.992–1.018) in low and high NDVI areas, respectively. Greenspaces have expanded over time in all districts of Seoul, and the risk of suicide for night-time heat decreased over time in both low and high NDVI areas. Our findings suggest that exposure to night-time heat is associated with an increased risk of suicide, but this risk may be mitigated by greater greenspaces in urban areas. Prioritizing development and maintenance of urban greenspaces will be a critical co-benefit strategy for promoting public mental health in changing climates.https://doi.org/10.1088/2752-5309/ad1c42hot nightsuicidegreennessspace-time-stratified case-crossover |
| spellingShingle | Jinah Park Jeongmin Moon Dohoon Kwon John S Ji Ho Kim Yoonhee Kim A protective role of urban greenspace on the association between night-time heat and suicide in Seoul, South Korea Environmental Research: Health hot night suicide greenness space-time-stratified case-crossover |
| title | A protective role of urban greenspace on the association between night-time heat and suicide in Seoul, South Korea |
| title_full | A protective role of urban greenspace on the association between night-time heat and suicide in Seoul, South Korea |
| title_fullStr | A protective role of urban greenspace on the association between night-time heat and suicide in Seoul, South Korea |
| title_full_unstemmed | A protective role of urban greenspace on the association between night-time heat and suicide in Seoul, South Korea |
| title_short | A protective role of urban greenspace on the association between night-time heat and suicide in Seoul, South Korea |
| title_sort | protective role of urban greenspace on the association between night time heat and suicide in seoul south korea |
| topic | hot night suicide greenness space-time-stratified case-crossover |
| url | https://doi.org/10.1088/2752-5309/ad1c42 |
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