Yoshihiro Kokubo - Academia.edu (original) (raw)
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Papers by Yoshihiro Kokubo
The Lancet, 2014
Background In 2010, overweight and obesity were estimated to cause 3.4 miilion deaths, 3.9% of ye... more Background In 2010, overweight and obesity were estimated to cause 3.4 miilion deaths, 3.9% of years of life lost, and 3.8% of disability-adjusted life-years (DALYs) worldwide. The nse in obesity has led to widespread calls for regular monitonng of changes in overweight and obesity prevalence in a11 populations. Comparable, up-to-date information about levels and trends is essential to quantify population health effects and to prompt decision makers to pnoritise action. We estimate the global, regional, and national prevalence of overweight and obesity in children and adults during 1980-2013.
International Journal of Stroke, 2014
The greatest potential to reduce the burden of stroke is by primary prevention of first-ever stro... more The greatest potential to reduce the burden of stroke is by primary prevention of first-ever stroke, which constitutes three quarters of all stroke. In addition to population-wide prevention strategies (the 'mass' approach), the 'high risk' approach aims to identify individuals at risk of stroke and to modify their risk factors, and risk, accordingly. Current methods of assessing and modifying stroke risk are difficult to access and implement by the general population, amongst whom most future strokes will arise. To help reduce the burden of stroke on individuals and the population a new app, the Stroke Riskometer TM , has been developed. We aim to explore the validity of the app for predicting the risk of stroke compared with current best methods. Methods 752 stroke outcomes from a sample of 9501 individuals across three countries (New Zealand, Russia and the Netherlands) were utilized to investigate the performance of a novel stroke risk prediction tool algorithm (Stroke Riskometer TM ) compared with two established stroke risk score prediction algorithms (Framingham Stroke Risk Score [FSRS] and QStroke). We calculated the receiver operating characteristics (ROC) curves and area under the ROC curve (AUROC) with 95% confidence intervals, Harrels C-statistic and D-statistics for measure of discrimination, R 2 statistics to indicate level of variability accounted for by each prediction algorithm, the Hosmer-Lemeshow statistic for calibration, and the sensitivity and specificity of each algorithm. Results The Stroke Riskometer TM performed well against the FSRS five-year AUROC for both males (FSRS = 75·0% (95% CI 72·3%-77·6%), Stroke Riskometer TM = 74·0(95% CI 71·3%-76·7%) and females [FSRS = 70·3% (95% CI 67·9%-72·8%, Stroke Riskometer TM = 71·5% (95% CI 69·0%-73·9%)], and better than QStroke [males -59·7% (95% CI 57·3%-62·0%) and comparable to females = 71·1% (95% CI 69·0%-73·1%)]. Discriminative ability of all algorithms was low (C-statistic ranging from 0·51-0·56, D-statistic ranging from 0·01-0·12). Hosmer-Lemeshow illustrated that all of the predicted risk scores were not well calibrated with the observed event data (P < 0·006). Conclusions The Stroke Riskometer TM is comparable in performance for stroke prediction with FSRS and QStroke. All three algorithms performed equally poorly in predicting stroke events. The Stroke Riskometer TM will be continually developed and validated to address the need to improve the current stroke risk scoring systems to more accurately predict stroke, particularly by identifying robust ethnic/race ethnicity group and country specific risk factors.
Stroke; a journal of cerebral circulation, Jan 16, 2015
The Lancet, 2014
Background In 2010, overweight and obesity were estimated to cause 3.4 miilion deaths, 3.9% of ye... more Background In 2010, overweight and obesity were estimated to cause 3.4 miilion deaths, 3.9% of years of life lost, and 3.8% of disability-adjusted life-years (DALYs) worldwide. The nse in obesity has led to widespread calls for regular monitonng of changes in overweight and obesity prevalence in a11 populations. Comparable, up-to-date information about levels and trends is essential to quantify population health effects and to prompt decision makers to pnoritise action. We estimate the global, regional, and national prevalence of overweight and obesity in children and adults during 1980-2013.
International Journal of Stroke, 2014
The greatest potential to reduce the burden of stroke is by primary prevention of first-ever stro... more The greatest potential to reduce the burden of stroke is by primary prevention of first-ever stroke, which constitutes three quarters of all stroke. In addition to population-wide prevention strategies (the 'mass' approach), the 'high risk' approach aims to identify individuals at risk of stroke and to modify their risk factors, and risk, accordingly. Current methods of assessing and modifying stroke risk are difficult to access and implement by the general population, amongst whom most future strokes will arise. To help reduce the burden of stroke on individuals and the population a new app, the Stroke Riskometer TM , has been developed. We aim to explore the validity of the app for predicting the risk of stroke compared with current best methods. Methods 752 stroke outcomes from a sample of 9501 individuals across three countries (New Zealand, Russia and the Netherlands) were utilized to investigate the performance of a novel stroke risk prediction tool algorithm (Stroke Riskometer TM ) compared with two established stroke risk score prediction algorithms (Framingham Stroke Risk Score [FSRS] and QStroke). We calculated the receiver operating characteristics (ROC) curves and area under the ROC curve (AUROC) with 95% confidence intervals, Harrels C-statistic and D-statistics for measure of discrimination, R 2 statistics to indicate level of variability accounted for by each prediction algorithm, the Hosmer-Lemeshow statistic for calibration, and the sensitivity and specificity of each algorithm. Results The Stroke Riskometer TM performed well against the FSRS five-year AUROC for both males (FSRS = 75·0% (95% CI 72·3%-77·6%), Stroke Riskometer TM = 74·0(95% CI 71·3%-76·7%) and females [FSRS = 70·3% (95% CI 67·9%-72·8%, Stroke Riskometer TM = 71·5% (95% CI 69·0%-73·9%)], and better than QStroke [males -59·7% (95% CI 57·3%-62·0%) and comparable to females = 71·1% (95% CI 69·0%-73·1%)]. Discriminative ability of all algorithms was low (C-statistic ranging from 0·51-0·56, D-statistic ranging from 0·01-0·12). Hosmer-Lemeshow illustrated that all of the predicted risk scores were not well calibrated with the observed event data (P < 0·006). Conclusions The Stroke Riskometer TM is comparable in performance for stroke prediction with FSRS and QStroke. All three algorithms performed equally poorly in predicting stroke events. The Stroke Riskometer TM will be continually developed and validated to address the need to improve the current stroke risk scoring systems to more accurately predict stroke, particularly by identifying robust ethnic/race ethnicity group and country specific risk factors.
Stroke; a journal of cerebral circulation, Jan 16, 2015