心血管疾病患者為溫度變化之主要衝擊對象，衝擊程度因性別、肥胖度以及地域而異。本研究， 探討東台灣男性急性心肌梗塞(acute myocardial infarction)發作日日均温（日均温)與身體質量指數之相關 性。以病歷調閱法，查閱東台灣男性首次急性心肌梗塞之發作年、月、日、年齡、地址以及危險因子。 探討的危險因子包括抽菸有無、糖尿病有無、高血壓有無、總膽固醇值以及身體質量指數值，並計算危 險因子數。依身體質量指數值[body mass index(kg/m2): BMI]分成過輕型(BMI< 18.5)與非過輕型(BMI2 18.5)，非過輕型包括正常組(18.5SBMI<23.9)、過重組(24.0SBMI<26.9)以及肥胖組(BMI227.0)。由交 通部中央氣象局大氣監測站提供急性心肌梗塞發作日所在地氣象站之日均温。採邏輯迴歸模型(logistic regression model)，過輕型急性心肌梗塞與否為依變數，計算過輕型急性心肌梗塞與否相關自變數(年齡、 曰均温、危險因子數)之勝算比(odds ratios)與95%信賴區間(conference interval)。結果：計1218名符合對 象群定義者(17歲至97歲，平均64.2±13.7歲）。過輕型、正常組、過重組以及肥胖組人數分別為48 ’ 435 ’ 389 以及 346 名。年齡(OR 1.060; 95%CI=1.032-1.088)、日均溫(OR 0.920; 95%CI=0.866-0.977)以及危險因 子數(OR 0.670; 95%CI=0.482-0.933)為過輕型急性心肌梗塞患者之顯著危險因子。結論：東台灣男性首次 急性心肌梗塞發作日日均溫與身體質量指數值相關，發作日日均溫於過輕型呈較低值。過輕型急性心肌 梗塞，其危險因子數較少，平均年齡較高。

Cardiovascular patients are the main group which is highly impacted by temperature changes. The degree of impact depends on the status of age, obesity, and habitat. This study analyzed the average temperature of the onset date and body mass index in male patients with acute myocardial infarction (AMI). With chart reviewing, the onset date, age, address, and risk factors of patients with first-time AMI in Eastern Taiwan were recorded. The risk factors analyzed included smoking, diabetes, hypertension, total cholesterol value, and body mass index(BMI, kg/m). The number of risk factors was calculated as well. Based on the BMI, subjects were divided into underweight group (BMI<18.5) and non-underweight group (BMI^ 18.5). Furthermore, non-underweight group was divided into normal (18.5^BMI<23.9), overweight (24.0^BMI<26.9)，and obesity group (BMI^27.0). Central Weather Bureau provided the average temperature from the local weather station on the onset date of AMI. Using whether underweight group or not as a dependent variable, logistic regression model was performed to provide odds ratios (OR) and 95% confidence interval (CI) of age, average temperature on the onset date, and number of risk factors. A total of 1218 subjects were included in the study, aged from 17 to 97 years (64.2士13.7 years). Sample size for each subgroup was: underweight group: 48, normal group: 435, overweight group: 389, and obesity group: 346. The age (OR 1.060; 95%CI=1.032-1.088), the average temperature on the onset date (OR 0.920; 95%CI=0.866-0.977), and the number of risk factors (OR 0.670; 95%CI=0.482-0.933) were significant risk factors for underweight group. The average temperature on the onset date was lower in underweight group in male patients with first-time AMI in Eastern Taiwan. The number of risk factors was less and the average age was higher in the underweight group.