Results (
Thai) 1:
[Copy]Copied!
Considering the potentially nonlinear and lagged associationsbetween ambient temperature and adverse cardiovascular outcomes,we used a distributed lag nonlinear model (DLNM) to estimatethe effects of temperature on OHCD mortality. Specifically, to establish a “cross-basis” function of temperaturebased on the DLNM, we used a natural cubic spline with 5 dfto account for the nonlinear effect of temperature, and also used anatural cubic spline with 5 df to account for the lagged effects (lagspace) of temperature. Because it is not easy todetermine the maximum lag of the effects, we alternatively usedmultiple lag intervals including days 0e3, 0e7, 0e14 and 0e21. Wethen introduced the “cross-basis” matrix of temperature into theGAM. We further controlled for time trends (7 df per year in naturalfunctions) and day of the week, as well as the same-day airpollutant concentrations (PM2.5 and O3). We first flexibly plottedthe relative risks (RRs) of the temperature-mortality associationcurves. Then, we calculated the RR comparing the 1st percentile oftemperature to the minimum-mortality temperature (MMT) andthe RR comparing the 99th percentile of temperature to the MMT.Further, to quantify these effects per an absolute change (1 C) intemperature, we calculated them as the log-RR divided by therange from the MMT to the corresponding temperature percentiles. In brief, the cold effect was defined as the percentเพิ่มขึ้นทุกวันตายต่อ 1 C ลดต่ำกว่า MMT และผลความร้อนถูกกำหนดเป็นการเพิ่มเปอร์เซ็นต์ในการตายทุกวันต่อ 1 C เพิ่มเหนือ MMT
Being translated, please wait..
