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As for the hours of watching TV, while the majority of Korean girls answered 1-2 hours, the majority of Chinese girls (86.8%) answered less than 1 hour. There was a significant difference in the hours of watching TV between countries (χ2 = 164.38, P < .001). As for the average hours of playing games and using computers, while the majority of Korean girls (33.5%) answered 1-2 hours, the majority of Chinese girls (78.9%) answered less than 1 hour. There was a significant difference (χ2 = 127.48, P < .001).
Life stress scores in Korean girls and Chinese girls were 2.68 and 2.64, respectively, against the total of 5 points. There was no significant difference. In both groups, academic performance was the most stressful factor. Personal reasons and circumstances followed academic performance in the Korean girl group, and in the Chinese girl group, personal reasons and school life were the second and third stressful factors.
As for the daily average number of hours sleep, both Korean girls and Chinese girls answered 6-8 hours most, and there was no difference between the two countries. With regard to regular exercise, the rate of Chinese girls who frequently do regular exercise was higher than Korean girls. This is similar to the result in the Korean survey on the healthy status of youth and children by the National Youth Policy Institute which says the rate of Korean female high school students who do physical activities 5 times or more a week was 6.4% and Chinese female high school students 13.2% . In this study, Korean female high school students spent more time watching TV and using PCs compared to Chinese girls. This trend is shown in a study on the comparison of learning mentality and status between high school students in China, Japan, Korea and the United States, in which the PC use rates of Korean students and Chinese students are 91.0%, 39.3%, respectively. Leisure activities of female middle school students in big cities in China are playing computer games (16.8%), watching TV/DVD (17.9%) or playing sports (9.2%) . However, Korean youth spend spare time on weekends or holidays watching TV/DVD (61.6%) or playing computer games (49.6%), according to Statistics Korea . This is in line with the results of this study. As Korean girls do less exercise and spend more time watching TV and using PCs than Chinese girls, efforts to improve physical exercise are needed in Korean students.
With regard to sources for information on nutrition, Korean girls get the information from the Internet or PCs most, but Chinese girls learn the information from TV or radio most. This is different from the result in 2006, when TV and radio were the youth's main sources to get nutrition information . Compared to Chinese girls, more Korean girls get nutritional knowledge through school learning (22.6%). However, previous studies on female middle school students  and female high school students  found higher rates of students who get nutritional knowledge through school learning as 47.0% and 35.6% respectively. In short, the result of this study is higher compared to Chinese girls but lower than the previous studies. In Korea, a system to verify nutrition information is not yet established and female students can accept information on the Internet indiscriminately, so schools should enhance nutritional education. Chinese girls' confidence in learned nutrition information and performance was found to be higher than Korean girls, and awareness of the need for nutritional education was higher in Chinese girls than in Korean girls. This explains Table 3, which shows that Chinese girls' nutritional knowledge was lower than Korean girls but Chinese girls' dietary habit were better than Korean girls'.
As for stress, there was no significant difference between the two countries re total points. However, while Korean girls were more vulnerable to circumstances than Chinese girls, Chinese girls were more vulnerable to school life than Korean girls. Academic performance was the most stressful factor for both groups. Personal reasons and circumstances followed academic performance factor in Korean girls, and personal reasons and school life followed academic performance in Chinese girls. Stress factors in Korean adolescents are various including family problems such as family conflict, school life problems such as excessive studying and poor academic performance, peer relationships such as dating, and problems related to themselves . The result of this study is similar to a report that school life and academic performance are the most stressful factors in high school students  and a report that 87.8% of Korean adolescents were stressed out for 1 year and among them, 72.6% were stressed out because of academic performance , but is different from a report that looks and appearance is the most stressful factor . The reason why both groups answered academic performance as the most stressful factor, is that Korea and China have an educational system focusing on entering colleges so students in both countries are suffering from pressure to attain good scores to enter colleges . Among Korean, Chinese, American and Japanese students, Chinese students were stressed out most, according to a survey on stress levels of students in the four countries .
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