A comparison of the effect of diurnal temperature range and apparent temperature on cardiovascular disease among farmers in Qingyang, Northwest China

Abstract Background: Apparent temperature (AT) and diurnal temperature range (DTR) have been extensively used to evaluate the effects of temperature on cardiovascular disease (CVD). However, few studies have analyzed and compared their effects on CVD in less-developed, rural areas of China.Methods: A case-only analysis was conducted of 43,567 cases of CVD morbidity in Qingyang (Northwest China) in 2011–2017 and the effects of thermal indicators were assessed using distributed lag nonlinear modelling and a Poisson regression model. Data on CVD morbidity originated from the New Rural Cooperative Medical Insurance of Gansu Province and meteorological variables were provided by the Meteorological Science Data Sharing Service.Results: Both AT and DTR had significant nonlinear and delayed impacts on hospital admissions for CVD. DTR had a stronger and more persistent effect on CVD incidence than AT. Women were more affected by high AT and low DTR than were men, while men were more vulnerable to low AT and high DTR. Temperature effects were not significantly different between people above and below 65 years of age.Conclusions: These findings provide local public health authorities with reference data concerning sensitive temperature indices for susceptible populations with a view to improving CVD preventive strategies in rural areas.

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A Comparison of the Effect of Diurnal Temperature Range and Apparent Temperature on Cardiovascular Disease among Farmers in Qingyang, Northwest China

10.21203/rs.3.rs-770864/v1 ◽

2021 ◽

Author(s):

Guangyu Zhai ◽

Jintao Qi ◽

Xuemei Zhang ◽

Wenjuan Zhou ◽

Jiancheng Wang

Keyword(s):

Cardiovascular Disease ◽

Rural Areas ◽

Diurnal Temperature Range ◽

Hospital Admissions ◽

Northwest China ◽

Gansu Province ◽

Apparent Temperature ◽

Science Data ◽

Diurnal Temperature ◽

Temperature Range

Abstract Background Apparent temperature (AT) and diurnal temperature range (DTR) have been extensively used to evaluate the effects of temperature on cardiovascular disease (CVD). However, few studies have analyzed and compared their effects on CVD in less-developed, rural areas of China. Methods A case-only analysis was conducted of 43,567 cases of CVD morbidity in Qingyang (Northwest China) in 2011–2017 and the effects of thermal indicators were assessed using distributed lag nonlinear modelling and a Poisson regression model. Data on CVD morbidity originated from the New Rural Cooperative Medical Insurance of Gansu Province and meteorological variables were provided by the Meteorological Science Data Sharing Service. Results Both AT and DTR had significant nonlinear and delayed impacts on hospital admissions for CVD. DTR had a stronger and more persistent effect on CVD incidence than AT. Women were more affected by high AT and low DTR than were men, while men were more vulnerable to low AT and high DTR. Temperature effects were not significantly different between people above and below 65 years of age. Conclusions These findings provide local public health authorities with reference data concerning sensitive temperature indices for susceptible populations with a view to improving CVD preventive strategies in rural areas.

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Impact of Diurnal Temperature Range on Cardiovascular Disease Hospital Admissions among Chinese Farmers in Dingxi(the Northwest China)

10.21203/rs.3.rs-140438/v1 ◽

2021 ◽

Author(s):

Jintao Qi ◽

Guangyu Zhai ◽

Guorong Chai

Keyword(s):

Cardiovascular Disease ◽

Rural Areas ◽

Diurnal Temperature Range ◽

Hospital Admissions ◽

Meteorological Data ◽

Northwest China ◽

Gansu Province ◽

Cvd Risk ◽

Diurnal Temperature ◽

Temperature Range

Abstract Background: Diurnal temperature range (DTR), an important index of climate change, has been widely applied in exploring its effect on cardiovascular disease (CVD). However, few studies have investigated the correlations between DTR and CVD in poor rural areas in China. Methods: Therefore, using a distributed lag nonlinear model and a Poisson regression model, we evaluated this relationship among farmers living in the city of Dingxi (Northwest China). From 2016 to 2019, we obtained outpatient visits for CVD and meteorological data from the New Rural Cooperative Medical Insurance of Gansu Province (NRCMI) and Meteorological Science Data Sharing Service, respectively. The effects of DTR were examined in subgroups stratified by gender and age. Results: We observed nonlinear M-patterns between DTR and CVD hospitalizations among all subgroups when DTR was at the median level (13°C). Estimated effect of a relatively low DTR (5th percentile, 4°C) on the hospital admissions of CVD was stronger than the effect of a relatively high DTR (95th percentile, 19°C). We also found that the adverse effect of DTR on CVD risk was more pronounced in females and elderly than males and younger adults at the low DTR, and vice versa at the high DTR. Conclusions: These results could guide the local authorities to improve CVD preventive strategies in the rural areas.

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Impact of diurnal temperature range on cardiovascular disease hospital admissions among Chinese farmers in Dingxi (the Northwest China)

BMC Cardiovascular Disorders ◽

10.1186/s12872-021-02065-8 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Guangyu Zhai ◽

Jintao Qi ◽

Guorong Chai

Keyword(s):

Cardiovascular Disease ◽

Rural Areas ◽

Diurnal Temperature Range ◽

Hospital Admissions ◽

Rural China ◽

Northwest China ◽

Cvd Risk ◽

Diurnal Temperature ◽

Temperature Range ◽

Distributed Lag

Abstract Background Diurnal temperature range (DTR) has been widely applied in exploring its effect on cardiovascular disease (CVD). However, few studies have investigated the correlations between DTR and CVD in poor rural areas in China. This study aimed to examine the association between DTR and CVD in rural China. Methods A distributed lag nonlinear model was used to evaluate the relationship between DTR and CVD risk among farmers living in the city of Dingxi (Northwest China) in the period from January 1, 2016 to December 31, 2019. Results We observed nonlinear M-patterns between the relative risk (RR) of DTR (reference: median DTR, 12 °C) and CVD hospitalizations in all subgroups. The peak RR of CVD was noticed at DTR of 6 °C (total: 1.418; men: 1.546; women: 1.403; young: 1.778; old: 2.549) and 17 °C (total: 1.781; men: 1.937; women: 1.712; young: 2.233; old: 1.798). The adverse effect of DTR on CVD risk was more pronounced in females (RR 1.438) and elderly (RR 2.034) than males (RR 1.141) and younger adults (RR 1.852) at the extremely low (5th, 4 °C) DTR. The reverse was observed at the extremely high DTR (95th, 19 °C) (male: 1.267; females: 0.993; young: 1.586; old: 1.212). Conclusions DTR is associated with CVD morbidity. This association was more pronounced in women and elderly, but men and younger peoples at extremely high DTR (19 °C). Future measures should take DTR into account to prevent CVD among susceptible populations.

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