• 한국인구학
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• 제9권2호
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• pp.42-52
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• 1986

An attempt had been made to obtain current information on induced abortion among currently married women aged 15 to 44. The source of data was 1985 National Fertility and Family Planning Survey conducted by Korea Institute for Population and Health in may 1985. 1. At the time of the survey, 53 percent of currently married women aged 15 to 44 had experienced induced abortion: 25.5 percent of the respondents who had experienced induced abortion only one time and another 27.6 percent more than two times. 2. The proportion of women who had experienced induced abortion seemed to increase according to the advance in age. It seemed that there was no significant difference in the experience rate of induced abortion by academic career, and there was inverse relationship between the experience rate of induced abortion and the age at first marriage. The experience rate if induced abortion by the number of living children was highest among those who had three children as 65.6 percent. 3. To analyze the effect of induced abortion on fertility, this study employed multiple regression analysis as a statistical technique. Instead of index representing fertility level the number of living children served as dependent variable. Independent variables used in analysis included age, age at first marriage, education level, ideal number of children, religion, frequency of induced abortion, total number of pregnancies and participation in labor force. Standardized partial regression coefficient of induced abortion was no less than -0.61. So, it can be concluded that induced abortion offered the great contribution on the birth control. A consistant health education and efficient management of family planning program would be essential for effectiveness of contraceptive practice.

• Imaging Science in Dentistry
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• 제51권4호
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• pp.373-382
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• 2021

Purpose: Cone-beam computed tomography (CBCT) reconstructions were analysed to elucidate factors affecting the anatomical relationship between tooth roots and the mandibular canal(MC). Materials and Methods: Images of 300 volumetric tomography scans of patients aged between 20 and 79 years old (167 women and 133 men) were analysed. The mean distances between 2,053 dental root apices and the internal border of the MC were obtained by measuring the horizontal and vertical distances on coronal CBCT images. The actual distance was then calculated mathematically with the Pythagorean formula. The statistical significance of differences between men and women was assessed using the Mann-Whitney test. Correlations with patient age were evaluated with the Spearman rank correlation coefficient. Results: The mean distances ranged from 2.17 mm, for single right third molar roots in women, to 8.02 mm for single left third molar mesiolingual roots in men. The mean distances measured for the mandibular right second molar mesial roots and the right second premolar roots were larger in men than in women. Age showed a significant positive correlation with the measured distances for mesial and distal roots of the first and second molar on both sides and the right third molar, mesiolingual roots of the left third molar, and single roots of the right third molar. Conclusion: The root-to-mandibular canal distance depended on age and the type of tooth. In 2 root types, this distance was impacted by sex.

• 한국어류학회지
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• 제13권4호
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• pp.237-247
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• 2001

강원도 삼척시 호산리 호산천에서 채집된 꾹저구, 검정꾹저구, 무늬꾹저구 3종의 연령과 성장에 관하여 조사하였다. 체장 빈도 분포 조사에 의한 성별 성장조사에서 꾹저구의 당년생 수컷이 암컷보다 컸던 경우를 제외하고는 차이가 없었으나, 종간(種間)비교에서는 차이를 나타내었다. 즉, 꾹저구는 체장 45 mm 미만 집단이 당년생, 45~60 mm 집단이 1년생, 체장 60~80 mm 집단은 2년생, 80 mm 이상 집단은 3년생으로 추정되며 최대 체장은 105.0 mm였다. 검정꾹저구는 체장 55 mm 미만 집단이 당년생, 55~65 mm 집단은 1년생, 65~85 mm 집단은 2년생, 85 mm 이상 집단은 3년생으로 추정되며 최대 체장은 105.3 mm였다. 무늬꾹저구는 체장 40 mm 미만 집단이 당년생, 40~55 mm 집단은 1년생, 체장 55~75 mm 집단은 2년생, 체장 75 mm 이상은 3년생으로 추정되며 최대 체장은 85 mm를 넘지 않았다. 본 조사에서 만 4년생 이상되는 개체는 채집되지 않았고 암수간에 성장은 비슷하였다. 3종(種) 중 검정꾹저구가 모든 연령에서 다른 2종보다 성장이 약 5~10 mm 더 빨랐던 반면, 무늬꾹저구는 가장 느린 성장을 나타내었다 (p<0.0001). 체장의 성장에 따른 몸 부위의 형태적 변화를 공분산분석으로 비교검토해 본 결과, 종간(種間) 차이가 인정된 형질은 체고, 두장, 미병고, 상악장, 배지느러미의 길이였다. 즉, 꾹저구는 두장과 배지느러 길이에서 연령이 증가할수록 가장 빠른 성장을 나타내었고 검정꾹저구는 체고, 미병고, 상악장의 형질에서 가장 빠른 성장을 한 반면, 무늬꾹저구는 5개의 형질 모두 가장 느린 성장을 하였다.

• 한국환경생태학회지
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• 제25권6호
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• pp.861-866
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• 2011

우리는 제주도 대정읍에서 뼈나이테법(skeletochronology)을 사용하여 맹꽁이(Kaloula borealis)의 나이구조를 알아보았다. 조사는 번식기인 2009년 6월에 실시하였다. 측정된 개체수는 수컷이 38개체, 암컷이 58개체로 각 개체의 SVL(snout-vent length)과 체중을 측정하고 나이구조를 분석하였다. 수컷의 평균 SVL은 $43.69{\pm}3.44 mm$이며, 암컷은 $46.32{\pm}4.23mm$로 나타나고 있다. 첫 번식에 참여하는 수컷은 2살이고, 암컷은 3살로 나타났다. 가장 나이든 수컷은 8살이며 암컷은 10살이다. 그러므로 이 종의 수명은 수컷에서는 8살, 암컷에서는 10살 이상으로 볼 수 있으며 암수의 수명에서 암컷이 더 오래살고 있다. 또한 이 값은 통계적으로도 유의미하게 나타나고 있다. 성장곡선은 von Bertalanffy growth model을 사용하였으며, 성장계수(K)는 수컷이 0.56이며 암컷은 0.41이다. 최대성장크기는 수컷이 46.41 mm이며 암컷은 50.22 mm로 나타났다.

• 보건교육건강증진학회지
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• 제6권1호
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• pp.75-90
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• 1989

This study tries to show the physical growth patterns and various adolescent characteristics by using longitudinal data for the height, weight, chest girth and sitting height of 1, 132 high school students in Seoul. And this study also tries to show what influencing factors on the physical growth of this aged population. The followings are the results. 1. The boys have their peak velocity of height when they are 12~13 years old. And the girls have when they are 10~11 years old. Peak velocity of weight for boys is at the age of 13~14. And for girls is at the age ofr11~12. Peak velocity of chest girth for boys is at the age of 12~13. And for girls is at the age of 11~12. Peak velocity of sitting height for boys is at the age of 13~14. And for girls is at the age of 11~13. So girls of this period grow more rapidly by around two years than boys. 2. The menarche of girls begins at the age of 12.4. So it begins 1.4 year before peak height velocity period. 3. Of life behavior boys contingency coefficient between essential time and height and weight is .5150 and .479 5, that between studying time and height and weight is .3344 and and .2912(In case of girls is .4735, .4321, .3247, .3134).

• Journal of Oral Medicine and Pain
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• 제39권4호
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• pp.119-126
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• 2014

This review provides an overview of the most commonly used dental age estimation techniques which focus on radiological methods in Korean adults. The literature from 1995 through July 31, 2014, was searched, using PubMed, for publications in English language. In PubMed, the keywords 'tooth' OR 'dental' AND 'pulp' AND 'age estimation' were searched. Inclusion criteria was comprised of the following: the subjects were living adults and dental radiography (excluded computed tomography [CT] and cone-beam CT) was used to measure the pulpal size. Twenty articles that met the criteria were selected. The method of age estimation using dental radiographs for measuring pulp and tooth size was represented in all studies. The methods were assorted into three categories generally; Kvaal's, Ikeda's and Cameriere's methods. Those methods had certain limitations such as large error range and low correlation coefficient depending on populations, type of employed teeth and particular method. Various techniques and many studies have been published for age estimation from human teeth using dental radiographs, but those techniques showed various predictability and reliability. Therefore, future studies on larger samples with well-distributed age group using not only existing techniques but new techniques are necessary for deriving convincing results.

• Animal cells and systems
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• 제14권4호
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• pp.315-322
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• 2010

We studied and compared the age structure, body size, and growth rates of field populations of two Korean salamander species (Hynobius yangi and Hynobius quelpaertensis) to elucidate important aspects of basic population dynamics of these two endemic Hynobius species. In both populations, females were sexually mature at three years of age, while H. yangi and H. quelpaertensis males matured at two and three years of age, respectively. Both males and females of H. yangi and H. quelpaertensis attained a maximum age of 11 years and 10 years, respectively. In both species, the snout-vent length (SVL) and body weight (BW) of the females were greater than those of the males. The SVL, BW, and asymptotic SVL of both male and female H. yangi were smaller than those of H. quelpaertensis. The adult growth rates after sexual maturation of male and female H. yangi were lower than those of H. quelpaertensis, possibly resulting in the smaller body size of the former, although overall growth coefficients were not significantly different between the two species. We also compared the age structure and growth rates of three Korean and three Japanese species of Hynobius.

• 대한한방소아과학회지
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• 제37권3호
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• pp.111-120
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• 2023

Objectives The purpose of this study is to analyze the characteristic of the 157 pediatric patients who visited a Korean medical hospital for bone age (BA) measurement and to compare the BA measurement using Tanner-Whitehouse 3-based analysis software and specialists in pediatric Korean medicine to determine the relationships. Methods The study included 157 pediatric patients who visited a Korean medicine hospital for BA measurements from June 2021 to June 2023. They were analyzed to determine the characteristics and agreement of BA measurements using Tanner-Whitehouse 3-based analysis software and specialists using classification by age, intraclass correlation coefficient (ICC), and Bland-Altman plots. Results In total, 61.8% of the study population were boys and 38.2%, girls, with an average age of 11.32 ± 1.87. The types of growth were various, and the average of bone maturity was 0.48 ± 1.13 as concluded by analysis software and 0.38 ± 1.15 as concluded by the specialists. The ICC of two methods were excellent: 0.995 (overall), 0.996 (boys) and 0.994 (girls). However, BA determined by analysis software tended to be higher than that determined by specialists when the patients were young. Conclusions This study showed that patients visited the hospital for BA measurement regardless of their height, and the agreement of BA between the two methods can be used as a reference. However, there was differences in the trends between age and sex, which should be interpreted with caution.

• 생명과학회지
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• 제19권10호
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• pp.1403-1409
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• 2009

본 연구에서는 중년비만여성을 대상으로 비만의 발생요인으로 예상되는 요인을 이용하여 비만의 상태를 연령 척도화하여 비만연령(Obesity Age: OA)이라는 연령 추정식을 산출함과 동시에 비만도(비만연령)를 실제의 역연령과 검토하였고 비만연령의 추정식은 다음과 같다. OAS (Obesity Age Score)=$0.106*X_1+0.035*X_2+0.048*X_3+0.041*X_4+0.003*X_5-0.037*X_6-10.66$ (1) ($X_1$: BMI, $X_2$: 체중, $X_3$: 체지방률, $X_4$: 배둘레, $X_5$: 중성지방, $X_6$: $VO_{2max}$) OA (Obesity Age)=7.3*OAS+49.6*(-1) (2) Z=(CA-49.6)(1-0.03) (3) OAc (Obesity Age corrected)=1.03*CA-7.3*OAS+1.47 (4) 그리고 역연령과 추정된 비만연령(Obesity Age corrected: OAc)의 비교에서는 유의한 차이를 나타내지 않아 타당성이 확인되었으며, 총 6개의 측정항목으로 구성된 비만연령을 통해 비만자 개개인의 비만건강도(상태)를 용이하게 평가할 수 있을 것으로 기대하며, 추후에는 다른 집단에서의 적용가능 여부를 알아보기 위해 교차타당성을 검토해야할 것이라고 사료된다.

• 한국지역지리학회지
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• 제3권1호
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• pp.35-50
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• 1997

경기지역의 성별 연령구조의 공간적 분포양상은 서울과 인접한 서울주변지역과 경수축, 경인축, 경춘축, 고양-파주축, 의정부-동두천축, 하남 방향 등 각종 교통노선에 의해 서울과의 접근성이 양호한 지역에 상대적으로 젊은 연령층이 다수 거주하고 있음이 확인된다. 이들 지역은 기동성이 큰 젊은 연령층이 거주교외 화를 주도하여 집중적으로 살고 있는 거주교외지역과 중복된다. 이 지역에서는 교통체계가 개선되어 대중교통 및 자가용에 의해 기동성이 크게 증가되었고, 주택신도시 건설 등 정책적 변수가 작용하여 인구유입이 가속화되고 있으며, 경기지역으로의 공장이전, 본사 및 지사설립, 연구단지조성 등으로 취업기회가 확대되고 있을 뿐만 아니라, 서울주변지역의 쾌적성과 발전성이 예견되고 있기 때문에 사람들이 주거지를 선택하고 있다고 판단된다. 그리고 서울에서 멀어질수록 농촌적 기능이 많을수록 상대적으로 노년층의 연령구조물 보여준다. 경기지역의 성별 연령구조의 공간적 분포에서는 여성의 연령구조가 남성에 비해 현저하게 노령화구조률 나타내고 있음이 확인된다. 이것은 남성 연령구조지수의 평균치가 1592인데 비해 여성연령구조지수가 1386로 집계되어 상대적으로 노령화되어 있는 점에서도 드러난다.