The study focuses on the imputation for the longitudinal survey data which often has nonignorable nonrespondents. Local linear regression is used to impute the missing values and then the estimation of the time-depend...The study focuses on the imputation for the longitudinal survey data which often has nonignorable nonrespondents. Local linear regression is used to impute the missing values and then the estimation of the time-dependent finite populations means. The asymptotic properties (unbiasedness and consistency) of the proposed estimator are investigated. Comparisons between different parametric and nonparametric estimators are performed based on the bootstrap standard deviation, mean square error and percentage relative bias. A simulation study is carried out to determine the best performing estimator of the time-dependent finite population means. The simulation results show that local linear regression estimator yields good properties.展开更多
It remains unclear whether limitations in activities of daily living(ADL) increase the risk of stroke in older Chinese adults.This longitudinal study used data from the Chinese Longitudinal Healthy Longevity Survey to...It remains unclear whether limitations in activities of daily living(ADL) increase the risk of stroke in older Chinese adults.This longitudinal study used data from the Chinese Longitudinal Healthy Longevity Survey to investigate the effects of limitations in ADL on the incidence of stroke in older adults.Between 2002 and 2011,46,728 participants from 22 provinces in China were included in this study.Of participants,11,241 developed limitations in ADL at baseline.A 3-year follow-up was performed to determine the incidence of stroke.During the 3-year follow-up,929 participants(8.26%) and 2434 participants(6.86%) experienced stroke in the ADL limitations group and non-ADL limitations group,respectively.Logistic regression was used to analyze the effect of ADL limitations on the risk of stroke.The results showed that after adjusting for the confounding factors gender,age,weight,hypertension,diabetes,heart disease,natural teeth,hearing impairment,visual impairment,smoking,alcohol abuse,exercise,ethnicity,literacy,residential area,and poverty,the ADL limitations group had a 77% higher risk of developing stroke than the non-ADL limitations group.After propensity score matching,the ADL limitations group still had a 33% higher risk of developing stroke than the non-ADL limitations group(OR = 1.326,95% CI:1.174–1.497).These findings suggest that limitations in ADL are a stroke risk factor.展开更多
文摘The study focuses on the imputation for the longitudinal survey data which often has nonignorable nonrespondents. Local linear regression is used to impute the missing values and then the estimation of the time-dependent finite populations means. The asymptotic properties (unbiasedness and consistency) of the proposed estimator are investigated. Comparisons between different parametric and nonparametric estimators are performed based on the bootstrap standard deviation, mean square error and percentage relative bias. A simulation study is carried out to determine the best performing estimator of the time-dependent finite population means. The simulation results show that local linear regression estimator yields good properties.
基金supported by a grant from the Clinical Research Project of Affiliated Hospital of Guangdong Medical University of China,Nos.LCYJ2018A00 (to ZL) and LCYJ2019C006 (to YSC)the Natural Science Foundation of Guangdong Province of China,No.2020A151501284 (to ZL)+1 种基金the Science and Technology Planning Project of Zhanjiang of China,No.2018A01021 (to ZL)a grant from the Characteristic Innovation Projects of Colleges and Universities in Guangdong Province of China,No.2019KTSCX045 (to ZL)。
文摘It remains unclear whether limitations in activities of daily living(ADL) increase the risk of stroke in older Chinese adults.This longitudinal study used data from the Chinese Longitudinal Healthy Longevity Survey to investigate the effects of limitations in ADL on the incidence of stroke in older adults.Between 2002 and 2011,46,728 participants from 22 provinces in China were included in this study.Of participants,11,241 developed limitations in ADL at baseline.A 3-year follow-up was performed to determine the incidence of stroke.During the 3-year follow-up,929 participants(8.26%) and 2434 participants(6.86%) experienced stroke in the ADL limitations group and non-ADL limitations group,respectively.Logistic regression was used to analyze the effect of ADL limitations on the risk of stroke.The results showed that after adjusting for the confounding factors gender,age,weight,hypertension,diabetes,heart disease,natural teeth,hearing impairment,visual impairment,smoking,alcohol abuse,exercise,ethnicity,literacy,residential area,and poverty,the ADL limitations group had a 77% higher risk of developing stroke than the non-ADL limitations group.After propensity score matching,the ADL limitations group still had a 33% higher risk of developing stroke than the non-ADL limitations group(OR = 1.326,95% CI:1.174–1.497).These findings suggest that limitations in ADL are a stroke risk factor.
