http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
두 모집단 비율 비교에서 상대위험도와 승산비에 기초한 표본크기 추정
조성경 ( Seong Kyung Cho ),강위창 ( Wee Chang Kang ),채성산 ( Seong San Chae ) 한국보건정보통계학회 2011 보건정보통계학회지 Vol.36 No.1
Objectives: We suggested a method of calculating sample size to compare the relative risk or the odds ratio, in which we used the asymptotic distribution of the logarithm of its estimator. The empirical power of the proposed sample size was investigated through simulation studies. Methods: The proposed formula of calculating sample size was derived based on the score test statistic induced by the asymptotic distribution of the logarithm of the estimated relative risk or the estimated odds ratio. Through some simulation studies the empirical power of the proposed sample size was compared with that of the sample size formulated from the asymptotic distribution of the difference between two estimated proportions. Results: When true relative risks or odds ratios were greater than 1, the power of the proposed sample size was more close to the intended power than that of the sample size obtained by the commonly used formula in the comparison of two proportions. Conclusions: When the comparison of two proportions should be carried out with the relative risk or odds ratio, the proposed formulas gave us more valid sample size than the formula derived by the test statistic of the difference between two proportions.
다이어트 프로그램이 성인여성의 체중감량과 건강관련지수에 미치는 효과
박희정(Hee Jung Park),조성경(Seong Kyung Cho),구재옥(Jea Ok Koo) 대한지역사회영양학회 2013 대한지역사회영양학회지 Vol.18 No.6
This study was carried out to analyze the effect of a diet program for adult women on weight loss, BMI, eating habits, sleeping habits, health related indices. The subjects was 415 participants of the 10 weeks (20 time participation program). The data was collected by basic somatometry and HRV (Heart Rate Variability) / APG (Accelerated Plethysmograph) Analyzer. The average age, height, weight and BMI were 28.6 years, 162.1 cm, 62.8 kg and 23.9 kg/m2, respectively. Their body types by BMI were under weight (1.2%), normal (45.8%), overweight (24.8%), mild obesity (22.7%) and obesity (5.5%). There were significant reductions of average weight (4.6 kg) and average BMI (1.75 kg/m2) on the 10th week. There were positive changes in vascular age (50.4%), stress index (44.6%), fatigue index (43.9%), health index (54.5%) of the subjects during the program. There was a meaningful difference of the average variation for the vascular age, stress index, fatigue index, and health index between two groups; one improving the eating habit and the other did not (p < 0.05), and also there was a meaningful difference of the average variation for the fatigue index in both groups improving the sleeping habit (p < 0.05), but was not a meaningful difference of the average variation for the vascular age, stress index, and health index between two groups. There was a meaningful difference of the average variation for the vascular age, stress index, fatigue index, and health index between two groups improving both eating and sleeping habit (p < 0.05). In conclusion, the weight loss program was effective on the weight loss and BMI reduction and health related indices.
The environmental burden of lung cancer attributable to indoor radon exposure in Korea
Juhwan Noh(노주환),Jungwoo Sohn(손정우),Heeseon Jang(장희선),Seong-Kyung Cho(조성경),Yun Tae Kim(김윤태),Eung Joo Park(박응주),Dae Ryong Kang(강대용),Dong Chun Shin(신동천),Changsoo Kim(김창수) 환경독성보건학회 2018 한국독성학회 심포지움 및 학술발표회 Vol.2018 No.6