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Development of Prediction Model for 1-year Mortality after Hip Fracture Surgery
Konstantinos Alexiou,Antonios A. Koutalos,Sokratis Varitimidis,Theofilos Karachalios,Konstantinos N. Malizos 대한고관절학회 2024 Hip and Pelvis Vol.36 No.2
Purpose: Hip fractures are associated with increased mortality. The identification of risk factors of mortality could improve patient care. The aim of the study was to identify risk factors of mortality after surgery for a hip fracture and construct a mortality model. Materials and Methods: A cohort study was conducted on patients with hip fractures at two institutions. Five hundred and ninety-seven patients with hip fractures that were treated in the tertiary hospital, and another 147 patients that were treated in a secondary hospital. The perioperative data were collected from medical charts and interviews. Functional Assessment Measure score, Short Form-12 and mortality were recorded at 12 months. Patients and surgery variables that were associated with increased mortality were used to develop a mortality model. Results: Mortality for the whole cohort was 19.4% at one year. From the variables tested only age >80 years, American Society of Anesthesiologists category, time to surgery (>48 hours), Charlson comorbidity index, sex, use of anti-coagulants, and body mass index <25 kg/m2 were associated with increased mortality and used to construct the mortality model. The area under the curve for the prediction model was 0.814. Functional outcome at one year was similar to preoperative status, even though their level of physical function dropped after the hip surgery and slowly recovered. Conclusion: The mortality prediction model that was developed in this study calculates the risk of death at one year for patients with hip fractures, is simple, and could detect high risk patients that need special management.
The Scarring Effects of Initial Labor Market Conditions on South Korean Nurses
Ahmed Saade,Constantinos Alexiou,Yacine Belghitar 서울대학교 경제연구소 2024 Seoul journal of economics Vol.37 No.3
Using a longitudinal dataset spanning the period 2000-2020, and an identification strategy based on instrumental variables, we examine the existence of scarring in the context of the Korean nursing profession. We find that the prevailing unemployment rate at time of graduation has negative effects on nurses’ wages that remain highly significant up to 6 years after joining the labor market, while working hours are positively scarred for up to 10 years. We also estimate a series of happiness equations to understand nurses’ experiences after joining the labor market, and find that a higher unemployment rate at time of graduation is associated with feelings of worse financial conditions, less happy lives, and lower income satisfaction.
Robotization and Labor Supply in the Context of a Dynamic Monopsony: Novel Evidence from South Korea
Ahmed J. Saade,Constantinos Alexiou,Yacine Belghitar 서울대학교 경제연구소 2022 Seoul journal of economics Vol.35 No.3
We estimate the effects of robotization on labor supply in Manufacturing, Services and the whole of the South Korean economy using exponential hazard and a random effects logit methodologies over the period 1999-2019. Our findings suggest that a larger operational stock of industrial robots in manufacturing is associated with manufacturing (non-manufacturing) workers becoming more (less) responsive to a change in wages in their decision to quit to non-employment, whilst the ease with which firms can poach workers is found to be unaffected by robotization.