目的：本研究主要的目的在探討國中生電子設備使用的時間長度、身體質量和學業成績表現之相關。方法：以台南市國中生為母群體，於某國中採隨機抽樣，於國三23班抽取8班，共170名國三學生，回收有效問卷共計160份，佔施測問卷的94.11%，以青少年睡眠習慣問卷、兒童日間嗜睡問卷以及問卷調查：兒童3C 產品使用與上網行為調查為量表蒐集資料。問卷指標之間以描述性統計，並針對問卷的各指標使用皮爾森積差相關和單因子變異數分析 (one-way ANOVA) 進行資料處理和分析，以探討國中青少年睡眠行為、睡眠品質、生活行為與身體質量指數之相關。結果：一、參與受測的國中生男女比例為各50%，約81%的參與者自己擁有手機，上課日使用3C產品時長，超過3小時以上者佔33%，2到未滿3小時者佔28.5%，1到未滿2小時者佔21%，其餘的（未滿30分鐘或沒在使用）者佔16%。二、參與者每天使用3C產品的時長會對身高、睡眠週末週間變異量、睡眠品質、睡眠節律分數以及日間嗜睡分數有顯著影響。三、家長有無規範小孩使用3C產品的時長對參與者的週間睡眠量有顯著影響。結論：本研究所調查的台南市國中生普遍自己擁有手機，且長時間使用3C產品對睡眠品質、身高、睡眠型態以及學業成績表現等有顯著影響。建議加強對青少年的3C產品使用教育與睡眠健康管理和相關的衛教宣導。

The main purpose of this study is to explore the correlation between the duration of electronic device use, body mass index (BMI), and academic performance among junior high school students. Methods: Using a random sampling method, 8 classes were selected from Grade 9 in a certain junior high school in Tainan City, totaling 170 students. A total of 160 valid questionnaires were collected, representing 94.11% of the survey respondents. Data were collected using surveys to investigate adolescent sleep habits, daytime sleepiness, and a questionnaire on children's 3C product usage and internet behavior. Descriptive statistics, Pearson correlation, and one-way ANOVA were used for data processing and analyses. Results: (1) Among the participating junior high school students, the gender ratio was 50% male and 50% female. Approximately 81% of participants owned their own mobile phones. On school days, 33% of participants used 3C products for more than three hours, 28.5% for 2 to less than 3 hours, 21% for 1 to less than 2 hours, and the remaining 16% used them for less than 30 minutes or not at all. (2) The daily duration of 3C product usage by participants significantly affected their height, weekday and weekend sleep variability, sleep quality, sleep regularity scores, and daytime sleepiness scores. (3) Whether parents regulated their children's duration of 3C product usage had a significant impact on the participants' weekday sleep duration. Conclusions: Junior high school students in Tainan generally own mobile phones, and prolonged use of 3C products is significantly correlated with sleep quality, height, sleep patterns, and academic performance. It is recommended to enhance education on 3C product usage and promote sleep health management and related health education among adolescents.

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