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The effect characteristics of temperature on stroke mortality in Inner Mongolia and globally

  • Wenfang Guo
  • Maolin Du
  • Dejun Sun
  • Nengjun Zhao
  • Zhihui Hao
  • Rina Wu
  • Chao Dong
  • Xiaoling Sun
  • Chunfang Tian
  • Liqun Gao
  • Hongwei Li
  • Di Yu
  • Mingzhu Niu
  • Ruijie Wu
  • Juan SunEmail author
Original Paper

Abstract

The current study investigated the correlation between stroke mortality and temperature. Monthly and seasonal variations in stroke mortality were plotted and daily stroke-related deaths were calculated. The lag times were calculated using the time series analysis. The correlation between stroke incidence and the diurnal temperature range (DTR) was analyzed using case-crossover analysis. Global stroke mortality was described in five latitudes. In the eastern region of Inner Mongolia, the stroke mortality was 174.18/105, about twice of that of the midwestern regions (87.07/105), and temperature was negatively correlated with stroke mortality. Mortality peaked in the winter and troughed in the summer (χ2 = 13.634, P < 0.001). The days in which stroke-related deaths were greater than ten occurred between late October and early April. The effect of temperature on stroke incidence occurred during a lag time of 1 (P = 0.024) or 2 months (P = 0.039). A DTR over 13 °C was positively correlated (r = 0.95, P = 0.004) with stroke with a lag time of 1 day. The effect of temperature on stroke was shown to be the same for various populations. As the latitude increases, stroke mortality also increases with latitudes > 40°; the highest mortality was 188.05/105 at the highest latitude. Only in relatively cold regions as the temperature decreases does stroke mortality increase for various populations. Differences in the time lag as well as in the DTR lag and DTR critical point vary for both the temperature and region.

Keywords

Stroke Mortality Temperature Variation Diurnal temperature range 

Notes

Funding information

The study was supported by the Inner Mongolia Medical University Students Innovation and Entrepreneurship Program Training Project Autonomous Region. (No. 201810132010) and the Natural Science Foundation of Inner Mongolia in China (No. 2013MS1124).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

Supplementary material

484_2018_1647_MOESM1_ESM.docx (229 kb)
ESM 1 (DOCX 229 kb)

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Copyright information

© ISB 2018

Authors and Affiliations

  • Wenfang Guo
    • 1
  • Maolin Du
    • 2
  • Dejun Sun
    • 3
  • Nengjun Zhao
    • 4
  • Zhihui Hao
    • 3
  • Rina Wu
    • 3
  • Chao Dong
    • 2
  • Xiaoling Sun
    • 5
  • Chunfang Tian
    • 1
  • Liqun Gao
    • 2
  • Hongwei Li
    • 2
  • Di Yu
    • 2
  • Mingzhu Niu
    • 2
  • Ruijie Wu
    • 2
  • Juan Sun
    • 2
    Email author
  1. 1.Inner Mongolia Autonomous Region Academy of Chinese MedicineHohhotChina
  2. 2.Inner Mongolia Medical UniversityHohhotChina
  3. 3.Inner Mongolia People’s HospitalHohhotChina
  4. 4.Affiliated People’s Hospital Inner Mongolia Medical UniversityHohhotChina
  5. 5.Inner Mongolia Normal UniversityHohhotChina

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