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Formulations of Job Strain and Psychological Distress: A Four-year Longitudinal Study in Japan
Saiki Mayumi,Matthews Timothy A.,Kawakami Norito,Robbins Wendie,Jian Li 한국산업안전보건공단 산업안전보건연구원 2024 Safety and health at work Vol.15 No.1
Background Different job strain formulations based on the Job Demand-Control model have been developed. This study evaluated longitudinal associations between job strain and psychological distress and whether associations were influenced by six formulations of job strain, including quadrant (original and simplified), subtraction, quotient, logarithm quotient, and quartile based on quotient, in randomly selected Japanese workers. Methods Data were from waves I and II of the Survey of Midlife in Japan (MIDJA), with a 4-year follow-up period. The study sample consisted of 412 participants working at baseline and had complete data on variables of interest. Associations between job strain at baseline and psychological distress at follow-up were assessed via multivariable linear regression, and results were expressed as β coefficients and 95% confidence intervals including R2 and Akaike information criterion (AIC) evaluation. Results Crude models revealed that job strain formulations explained 6.93–10.30% of variance. The AIC ranged from 1475.87 to 1489.12. After accounting for sociodemographic and behavioral factors and psychological distress at baseline, fully-adjusted models indicated significant associations between all job strain formulations at baseline and psychological distress at follow-up: original quadrant (β: 1.16, 95% CI: 0.12, 2.21), simplified quadrant (β: 1.01, 95% CI: 0.18, 1.85), subtraction (β: 0.39, 95% CI: 0.09, 0.70), quotient (β: 0.37, 95% CI: 0.08, 0.67), logarithm quotient (β: 0.42, 95% CI: 0.12, 0.72), and quartile based on quotient (β: 1.22, 95% CI: 0.36, 2.08). Conclusion Six job strain formulations showed robust predictive power regarding psychological distress over 4 years among Japanese workers. Background Different job strain formulations based on the Job Demand-Control model have been developed. This study evaluated longitudinal associations between job strain and psychological distress and whether associations were influenced by six formulations of job strain, including quadrant (original and simplified), subtraction, quotient, logarithm quotient, and quartile based on quotient, in randomly selected Japanese workers. Methods Data were from waves I and II of the Survey of Midlife in Japan (MIDJA), with a 4-year follow-up period. The study sample consisted of 412 participants working at baseline and had complete data on variables of interest. Associations between job strain at baseline and psychological distress at follow-up were assessed via multivariable linear regression, and results were expressed as β coefficients and 95% confidence intervals including R2 and Akaike information criterion (AIC) evaluation. Results Crude models revealed that job strain formulations explained 6.93–10.30% of variance. The AIC ranged from 1475.87 to 1489.12. After accounting for sociodemographic and behavioral factors and psychological distress at baseline, fully-adjusted models indicated significant associations between all job strain formulations at baseline and psychological distress at follow-up: original quadrant (β: 1.16, 95% CI: 0.12, 2.21), simplified quadrant (β: 1.01, 95% CI: 0.18, 1.85), subtraction (β: 0.39, 95% CI: 0.09, 0.70), quotient (β: 0.37, 95% CI: 0.08, 0.67), logarithm quotient (β: 0.42, 95% CI: 0.12, 0.72), and quartile based on quotient (β: 1.22, 95% CI: 0.36, 2.08). Conclusion Six job strain formulations showed robust predictive power regarding psychological distress over 4 years among Japanese workers.
( Mayumi Toyama ),( Yasuyuki Okuma ),( Mitsutoshi Yamamoto ),( Kenichi Kashihara ),( Kazuto Yoshda ),( Hidemoto Saiki ),( Tetsuya Maeda ),( Yoshio Tsuboi ),( Takeo Nakayama ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Parkinson`s disease (PD) is increasingly recognized as multidimensional disorder. In addition to classic motor symptoms, patients have a variety of non-motor symptoms (NMS) that substantially affect quality of life (QoL). However, the prevalence of NMS and the relative impact of non-motor symptoms on QoL in PD have not been well documented in Japanese PD patients. In this study, we have the following objectives: 1) To determine the prevalence of NMS in Japanese PD patients. 2) To study the impact of NMS on the QoL in Japanese PD patients. Methods: This was a multi-center cross-sectional epidemiologic study. We recruited outpatients from seven Neurology departments at general hospitals across Japan between October 2010 and September 2011. A total of 824 Japanese PD patients was included in this study. NMS of patients was evaluated by Non-Motor Symptoms Scale (NMSS). Parkinson`s Disease Questionnaire-39 (PDQ-39) was used to evaluate the QoL of PD patients. Multivariate analyses were used to evaluate the direct impact of NMSs on QoL using PDQ-39, after adjusting for age, sex, disease duration, and the Unifi ed Parkinson`s Disease Rating Scale (UPDRS) Part I, Part II, Part III and Part IV. Results: The mean of total NMSS score was 37.4±35.4. The highly prevalent NMSS domains were sleep/fatigue (87.6%) and urinary (86.1%). The highly prevalent NMSS items were nocturia (72.0%) and constipation (71.6%). In multivariate analyses after adjustment for age, sex, disease duration, UPDRS Part I, Part II, Part III, and Part IV, total score of NMSS has statistical signifi cance with PDQ-39 (p=0.00, ß=0.16, Adj-R squared=0.65). Conclusions: NMS were highly prevalent in Japanese PD patients. NMS have a direct negative impact on QoL in Japanese PD patients.