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References Basu SK, Kshatriya G. 1989. Fertility and mortality in tribal populations of Bastar district, Madhya Pradesh, India. Biol Soc 6:100-12. Basu SK. 1993. Health status of tribal women in India. Soc Change 23(4):19-39. Basu SK, Kshatriya G. 1993. Demographic features and health care practices in Dudh Kharia tribal population of Sundergarth district Orissa [communicated], cited by Basu 1993. Bhat MPN. 2000. Life tables for India in the 1990s. Report prepared for the Sample Registration System. New Delhi, India: Population Research Centre, Institute of

Abstract

The life table characteristics of the invasive snail Physa acuta were assessed in the laboratory using the individuals occurring in a newly colonised area in Burdwan, West Bengal, India. Using the changes in the shell length and the body weight of the snails as surrogate, the population growth of the snails was estimated along with longevity and the fecundity schedule. The cohort of P. acuta lived for a maximum of 22 weeks with a life expectancy (ex) of 7.27 weeks and the age-specific survivorship being 0.825. Increment of the shell length of the snails complied with the von Bertalanffy growth equation, lt = 11.75(1 − exp−0.17(t−0.06)), and the observed and the expected data of the length at time t (lt) did not vary significantly (z score = 0.230; P = 0.818; n=20 pairs). Following attainment of sexual maturity between 28 and 42 days, oviposition continued till 20 weeks time, with 0.1-10 eggs laid by each individual. The eggs present per capsule remained between 01 and 11, whilst the net reproductive rate (R0), intrinsic rate of increase (rm) and the finite rate of increase (λ) were 116.07, 0.1 and 1.11, respectively. The observations are similar to those made earlier on the same species but from African and South American continents. The results of the present observation are pioneer in providing the initial studies about the life history of the invasive snail P. acuta in Indian context. Using the present information as a basis, further studies including long-term population monitoring should be initiated to understand the effects of the invasive snail P. acuta in the freshwater ecosystem of West Bengal, India.

). Ageing population, Pension Funds and Financial Markets. Washington, D.C.: The World Bank. 7. Human Mortality Database (2000). Human Mortality Data Base. Available at: http://www.mortality.org [16 December 2017]. 8. Institute for Statistics of Federation of Bosnia and Herzegovina (2017). Detailed life tables of population of Federation of Bosnia and Herzegovina, Sarajevo: Institute for Statistics of Federation of Bosnia and Herzegovina. 9. Institute of Actuaries and Faculty of Actuaries (1990). Continuous Mortality Investigation . Available at https

reduced mortality from various groups of causes of death made between 1997 and 2014, and potential improvements, using Spain, with the highest e 0 among all EU countries in 2014, as a benchmark. We also look for differences between groups of causes of death in age terms, in which the strongest gains in e 0 are possible. By decomposing potential gains in e 0 by age, we thus show whether these gains are potentially greater in working ages, or when people are mostly retired. 2 Methods In this study, we employ life tables that are used to describe age

Abstract

Aim: To assess the effect of the factor ‘hepatic metastatic disease’ on long-term outcomes in patients with colorectal cancer.

Materials and methods: We analysed retrospectively 200 randomly selected patients. Forty-two of them were excluded from the study for different reasons so the study contingent was 158 patients over a period of 23 years. All were diagnosed and treated in the Lozenetz University Hospital, in the Department of General Surgery. 125 of the patients were diagnosed with colorectal cancer without distant metastases and 33 of the patients had liver metastases as a result of colorectal carcinoma. The statistical analysis was performed using SPSS 19 IMB, with a level of significance of P < 0.05 at which the null hypothesis is rejected. We also used descriptive analysis, Kaplan-Meier estimator, Log-Rank Test and Life-Table statistics models.

Results: The median survival for patients without metastases was 160 months, and the median was 102 months. The median survival for patients with liver metastases was 28 months and the median was 21 months. One-year survival for patients without metastases was 92% versus 69% in patients with liver metastases. Conclusion: Average, annual and median survivals are influenced statistically significantly by the presence of liver metastases compared to overall survival and that of patients without metastatic colorectal cancer. Liver metastatic disease is a proven factor affecting long-term prognosis and survival in patients with colorectal cancer.

Abstract

The purpose of this study is to estimate the future duration of a loan contract on the basis of several factors. The main methodology consists of a brief explanation of a survival analysis and a thorough application of a survival analysis in loan management. A real dataset from a credit institution (situated in Varna) is used. All contracts were signed for 30 days but some contracts were ended earlier, others - later. The main research question concerns the following statement. We may try to predict future loan duration by making an econometric model describing the dependency between the loan duration (as a dependent variable) and several independent variables. The dataset is analysed by calculating life tables, applying the Kaplan-Maier method and using Cox regression within SPSS. It is has been proved that the main covariates affecting loan duration are the variables: born in the region, month of birth and age. The formulated conclusions are valid for the analysed credit institution. This work provides a methodology for adapting duration models in credit institutions. The presented methodology (in this paper) may be applied over the dataset of other credit institutions (including banks) for loan duration prediction.

Abstract

Background. The treatment of large arteriovenous malformations (AVMs) or AVMs involving eloquent regions of the brain remains a challenge. For inoperable lesions, observation, volume-staged radiosurgery or hypofractionated stereotactic radiotherapy (HFSRT) are proposed. The aim of our study was to assess the safety and efficiency of HFSRT for large AVMs located in eloquent areas of the brain.

Materials and methods. An analysis of records of 49 patients irradiated for cerebral AVMs with a mean dose of 19.9 Gy (12-28 Gy) delivered in 2-4 fractions with planned gap (at least one week) between fractions. Actuarial obliteration rates and annual bleeding hazard were calculated using Kaplan-Meier survival analysis and life tables. Results. Annual bleeding hazard rates were 4.5% and 1.6% after one and two years of the follow-up, respectively. Actuarial total obliteration rates were 7%, 11%, and 21% and total response rate (total and partial obliterations) 22%, 41%, and 55% after one, two and three years of the follow-up, respectively. There was a trend towards larger total obliteration rate in patients irradiated with fraction dose ≥ 8 Gy and total dose > 21 Gy for lesions of volume ≤ 8.18 cm3 which was not observed in case of partial obliterations.

Conclusions. HFSRT results with relatively low obliteration rate but is not associated with a significant risk of permanent neurological deficits if both total and fraction doses are adjusted to size and location of the lesion. Predictive factors for total and partial obliterations can be different; this observation, however, is not firmly supported and requires further studies.

References Bellovary J., Giacomino D., Akers M., 2007, A review of bankruptcy prediction studies: 1930 to present, Journal of Financial Education, vol. 33, Winter. Blossfeld H.P., Rohwer G., 2002, Techniques of Event History Modeling. New Approaches to Causal Analysis, Lawrence Elbaum Associates Publishers, London. Cox D.R., 1972, Regression models and life tables, Journal of the Royal Statistical Society (Series B), no. 34, pp. 187-202. Jagiełło R., 2013, Analiza dyskryminacyjna i regresja logistyczna w procesie oceny zdolności kredytowej przedsiębiorstw

References Cox D. R. (1972). Regression models and life tables (with discussion). Journal of the Royal Statistical Society, ser.B , 34, 187 - 202. Hryniewicz O. (2007). Statistical analysis of interval and imprecise data - applications in the analysis of reliability field data. In: Proceedings of the conference: The First Summmer Safety and Reliability Seminars 2007 - SSARS 2007, Gdańsk-Sopot, Poland, 22-29 July 2007, Gdynia Maritime University, 181-192. Hu J. X., Lawless J. F. (1996a). Estimation from truncated lifetime data with supplementary information on

References Cox D.R. (1972). Regression models and life tables (with discussion). Journal of the Royal Statistical Society, ser. B , v.34, p.187-202. Hryniewicz O. (2007). Statistical analysis of interval and imprecise data - applications in the analysis of reliability field data. In: Proceedings of the conference: The First Summer Safety and Reliability Seminars 2007 - SSARS 2007, Gdańsk-Sopot, Poland, 22-29 July 2007, Gdynia Maritime University, p.181-192. Hu J.X., Lawless J.F. (1996). Estimation from truncated lifetime data with supplementary information on