• Communications for Statistical Applications and Methods
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• 제4권2호
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• pp.491-496
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• 1997

For the survival data analysis of no covariate the discount survival model is proposed to estimate the time-varying hazard rate and the survival function recursively. In comparison with the covariate case it provide the distributionally explicit evolution of hazard rate between time intervals under the assumption of a conjugate gamma distribution. Also forecasting of the hazard rate in the next time interval is suggested, which leads to the forcecasted survival function.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제31권4호
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• pp.306-313
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• 2009

Objectives: The aim of the present review was to evaluate survival rate and various factors associated with survival of osseointegrated implants. Patients and methods: The clinical comparisons were performed to evaluate survival rate of 794 endosseous implants that had been inserted between 2004 through 2008 in relation to sex and age of patients, position of implant, implant system and surface characteristics, length and diameter of implant, and bone graft technique. Results: The survival rate of implant was 94.3% in posterior area of maxilla and 98.6% in posterior area of mandible by position of implant, a statistically significant difference. As to diameter of implant, survival rate was 98.4% between the 4.0 and 4.5 mm and 75.0% in larger than 5.0 mm, that was statistically significant difference. There was a statistically significant difference regard to bone graft and surgical technique. The implant survival rate was 89.0% in a placement site which performed sinus lifting, and in case of implant placement with guided bone regeneration technique and without bone grafting was 97.6% and 100% each. Conclusion: According to these findings, this study establishes a relationship between survival rate of implant and position, surface characteristics, diameter of implant and bone graft technique.

• 수산경영론집
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• 제42권3호
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• pp.79-93
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• 2011

Water temperature of Oliver flounder farm affects Oliver flounder growth and mortality rate. In laboratory experimental tanks, optimal water temperature was $22.5^{\circ}C$($21{\sim}24^{\circ}C$) and cultivatable water temperature was $12{\sim}28^{\circ}C$. The purpose of this study is to identify applicable and useful water temperature of Oliver flounder farm in case of actual farming. The data applied in the analysis was collected from Jeju island. In the study, various analytical methods including productivity analysis, regression analysis, statistical analysis were conducted for 13 Oliver flounder culture farms. The result of analysis can be summarized as follows : First, growth rate on the Oliver flounder culture farms was related to mean of water temperature, variation of water temperature and low water temperature. Second, survival rate on the Oliver flounder culture farms was related to mean of water temperature. In case of including Oliver flounder stocking density, defined as the surface area of Oliver flounder per $m^2$ of water surface area, survival rate strongly related to mean of water temperature, variation of water temperature, cultivating capability and stocking density. Third, production weight per $m^2$ of water surface area was strongly related to mean of water temperature, low water temperature and cultivating capability. Growth rate and survival rate was analyzed into mediate variable character.

• Asian Pacific Journal of Cancer Prevention
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• 제15권12호
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• pp.4839-4842
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• 2014

Background: Although the Cox's proportional hazard model is the popular approach for survival analysis to investigate significant risk factors of cancer patient survival, it is not appropriate in the case of log-term disease free survival. Recently, cure rate models have been introduced to distinguish between clinical determinants of cure and variables associated with the time to event of interest. The aim of this study was to use a cure rate model to determine the clinical associated factors for cure rates of patients with breast cancer (BC). Materials and Methods: This prospective cohort study covered 305 patients with BC, admitted at Shahid Faiazbakhsh Hospital, Tehran, during 2006 to 2008 and followed until April 2012. Cases of patient death were confirmed by telephone contact. For data analysis, a non-mixed cure rate model with Poisson distribution and negative binomial distribution were employed. All analyses were carried out using a developed Macro in WinBugs. Deviance information criteria (DIC) were employed to find the best model. Results: The overall 1-year, 3-year and 5-year relative survival rates were 97%, 89% and 74%. Metastasis and stage of BC were the significant factors, but age was significant only in negative binomial model. The DIC also showed that the negative binomial model had a better fit. Conclusions: This study indicated that, metastasis and stage of BC were identified as the clinical criteria for cure rates. There are limited studies on BC survival which employed these cure rate models to identify the clinical factors associated with cure. These models are better than Cox, in the case of long-term survival.

• Journal of Chest Surgery
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• 제21권1호
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• pp.87-100
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• 1988

The authors evaluated 200 cases of primary carcinoma of lung in terms of the cell type, operability, resectability and survival rate, that proved by histopathologic examination at the Dept. of Thoracic and Cardiovascular Surgery, Catholic Medical College during the period of 11 years from Jan., 1977 to Dec., 1987. The results are as follows; 1] The peak incidence was observed in the 7th decade of life [34%] and followed by 6th [30%] 8 5th decade [25%]. Male to female ratio was 3.4:1. 2] Histopathologic classifications were squamous cell carcinoma 48% [96 cases], adenocarcinoma 27% [34 cases], small cell carcinoma 13%[26 cases], ;bronchioloalveolar cell carcinoma 5% [10 cases], large cell carcinoma 4.5% [9 cases], adenosquamous cell carcinoma 1.5% [3 cases] and adenoalveolar cell carcinoma 0.5% [1 case]. 3] Among 200 cases of primary lung cancer, the operability was 47.5% [95 cases], refusal of operation 6.0% [12 cases] and inoperability 46.5% [93 cases]. 4] Ninety five cases [47.5%] were operated. Of these, post-surgical stage I was 18.9% [18 cases], stage II 24.2% [23 cases] and stage III 56.8% [54 cases]. Among 54 cases of stage III, 32 cases were unresectable, while 22 cases were resectable. Consequently, the resectability was 31.5% [63 cases] from the total numbers of 200 cases, and the resectability for the operable 95 cases was 66.3% [63 cases]. 5] Surgical complications were empyema with bronchopleural fistula [4 cases], G-I bleeding [1 case], tedious pleural effusion [1 case] and acute respiratory insufficiency [1 case]. Operative mortality was 3.2% [2 cases], which caused by massive G-I bleeding [1 case] and respiratory insufficiency [1 case]. 6] On the long term follow-up of resectable 63 cases, overall 3 year survival rate was 35%, 5 year 22% and 9 year 2%. Five year survival rate was 39% in stage l, 30% in stage II and 0% in stage III. As for the cell types, the higher 5 year survival rate was observed in resectable squamous cell carcinoma [35%] as compared to adenocarcinoma [15%], alveolar cell carcinoma [14%], small cell carcinoma [0%] and large cell carcinoma [0%].

• 한국환경보건학회지
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• 제5권1호
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• pp.66-70
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• 1978

This experiment is to search what some chemicals polluting water have an effect on the Rana nigromaculata Hallowell, in the survival rate and the metamorphosis speed from a tadpole to a young frog. 1. The fatal thickness by some agricultural chemicals and copper sulfate is different from one another. The fatal rate in the contrast group is 15 percent, and particulary Dithane M-45 is the most among the all reagents. 2. The effect on the anamorphosis is very severe. In the case of contrast group, it appears to stage 25, but it is not to appear at the group used agricultural chemicals. 3. The less the thickness of that is, the less the influence of the survival rate and the metamorphosis speed. 4. The density of the agricultural chemical is in inverse proportion to the survival rate and the metamorphosis speed, and the other side, the fatal rate is proportion.

• Asian Pacific Journal of Cancer Prevention
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• 제13권5호
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• pp.1995-1997
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• 2012

Background: Brain metastasis from cholangiocarcinoma (CCA) is a rare but fatal event. To the best of our knowledge, only few cases have been reported. Herein, we report the incident rate and a first case series of brain metastases from CCA. Methods: Between January 2006 and December 2010 5,164 patients were treated at Srinagarind hospital, Khon Kaen University; of those, 8 patients developed brain metastasis. Here we reviewed clinical data and survival times. Results: The incident rate of brain metastases from CCA was 0.15%. The median age of the patients was 60 years. Tumor subtypes were intrahepatic in 6 and hilar in 2 patients. All suffered from symptoms related to brain metastasis. Three patients were treated with whole-brain radiation therapy (WBRT), one of whom also underwent surgery. The median survival after the diagnosis of brain metastasis was 9.5 weeks (1-28 weeks). The longest survival observed in a patient in RPA class I with two brain lesions and received WBRT. Conclusion: This is a first case series of brain metastases from CCA with the incident rate of 0.15%. It is rare and associated with short survival time.

• Journal of Korean Neurosurgical Society
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• 제60권6호
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• pp.661-666
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• 2017

Objective : Atypical meningioma is rare tumor and there is no accurate guide line for optimal treatment. This retrospective study analyzed the prognostic factors, the effect of different methods of treatments and the behavior of atypical meningioma. Methods : Thirty six patients were diagnosed as atypical meningioma, among 273 patients who were given a diagnosis of meningioma in the period of 2002 to 2015. Age, gender, tumor location, Ki 67, Simpson grade and treatment received were analyzed. We studied the correlation between these factors with recurrence, overall survival rate and progression free survival. Results : Median overall survival time and progression free survival time are 60 and 53 (months). Better survival rate was observed for patients less than 50 years old but with no statistical significance (p=0.322). And patients with total resection compared with subtotal resection also showed better survival rate but no statistical significance (p=0.744). Patients with a tumor located in skull base compared with patients with a tumor located in brain convexity and parasagittal showed better progression free survival (p=0.048). Total resection is associated with longer progression-free survival than incomplete resection (p=0.018). Conclusion : We confirmed that Simpson grade was significant factor for statistically affect to progression free survival in univariate analysis. In case of skull base atypical tumor, it is analyzed that it has more recurrence than tumor located elsewhere. Overall survival was not affected statistically by patient age, gender, tumor location, Ki 67, Simpson grade and treatment received in this study.

• Journal of Chest Surgery
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• 제20권4호
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• pp.730-744
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• 1987

From Nov. 1980 to Jun. 1987, 270 primary lung cancer patients were operated on at the department of Thoracic & Cardiovascular Surgery, Seoul National University Hospital. There Were 223 males & 47 females with 55.5 years of mean age. There were 151 [55.9%] squamous cell ca., 43 [18.8%] adenoca., 8 [3.5%] undiff. large cell, 9 [3.9%] undiff. small cell ca. & 18 [7.9%] mixed type, and also composed of 65 [28.3%] stage I, 31 [13.5%] stage II and 133 [58.1%] of stage III cases. They received 78 [34.1%] lobectomies, 62 [27.1%] pneumonectomies and 60 [26.2%] exploratory thoracotomies with 70% resectability rate. The five year actuarial survival rate of all patients was 37%. According to TNM stage, five year survival rate of the patients in stage I was 71%, those of stage II was 29% and of stage III 21%. According to histological cell type, five year actuarial survival rate of the squamous cell ca. was 35%, of adenoca. 49%, of undiff. large cell. 22%, 2 year survival rate of undiff. small cell was 31% and 3 year survival rate of mixed type was 47%. Hospital death was 2 case with a 1.3% early postop. mortality rate.

• 한국시뮬레이션학회논문지
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• 제27권2호
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• pp.115-123
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• 2018

헬기에 DIRCM을 1개 또는 2개 탑재한 경우의 시뮬레이션을 위한 효과도 분석 기법을 정립하였다. 기만율 70% 이상 및 탐지율 100%일 때 DIRCM을 1개 장착시 10~30% 수준의 생존율을 보였고, 2개 장착시 70~80% 수준의 생존율을 나타내었으며, DIRCM의 기만율 증가에 따라 헬기 생존율이 증가하였다. 탐지율 70% 및 기만율 100% 이상일 때 DIRCM을 1개 장착시 10~30% 수준의 생존율을 보였고, 2개 장착시 70~80% 수준의 생존율을 나타내었으며, DIRCM의 탐지율 증가에 따라 헬기 생존율이 증가하였다. 기만율과 탐지율이 100%일 때 DIRCM을 1개 장착시 20~30%의 생존률을 보였고, 2개 장착한 경우 70~90% 수준의 생존율을 나타내었다.