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Inoue A.,University of Occupational and Environmental Health Japan | Kawakami N.,University of Tokyo | Shimomitsu T.,Tokyo Medical University | Tsutsumi A.,Kitasato University | And 4 more authors.
Industrial Health | Year: 2014

This study aimed to investigate the reliability and construct validity of a new version of the Brief Job Stress Questionnaire (New BJSQ), which measures an extended set of psychosocial factors at work by adding new scales/items to the current version of the BJSQ. Additional scales/ items were extensively collected from theoretical job stress models and similar questionnaires in several countries. Scales/items were field-tested and refined through a pilot internet survey. Finally, an 84-item questionnaire (141 items in total when combined with the current BJSQ) was developed. A nationally representative survey was administered to employees in Japan (n=1,633) to examine the reliability and construct validity. Most scales showed acceptable levels of internal consistency and test-retest reliability. Principal component analyses showed that the first factor explained 50% or greater proportion of the variance in most scales. A scale factor analysis and a correlation analysis showed that these scales fit the theoretical expectations. These findings provided a piece of evidence that the New BJSQ scales are reliable and valid. Although more detailed content and construct validity should be examined in future study, the New BJSQ is a useful instrument to evaluate psychosocial work environment and positive mental health outcomes in the current workplace. © 2014 National Institute of Occupational Safety and Health. Source


Yoshikawa T.,The Institute for Science of Labour
PloS one | Year: 2013

Determining incidence rates of needlestick and sharps injuries (NSIs) using data from multiple hospitals may help hospitals to compare their in-house data with national averages and thereby institute relevant measures to minimize NSIs. We aimed to determine the incidence rate of NSIs using the nationwide EPINet surveillance system. Data were analyzed from 5,463 cases collected between April 2009 and March 2011 from 67 Japanese HIV/AIDS referral hospitals that participated in EPINet-Japan. The NSI incidence rate was calculated as the annual number of cases with NSIs per 100 occupied beds, according to the demographic characteristics of the injured person, place, timing, device, and the patients' infectious status. The NSI incidence rates according to hospital size were analyzed by a non-parametric test of trend. The mean number of cases with NSIs per 100 occupied beds per year was 4.8 (95% confidence interval, 4.1-5.6) for 25 hospitals with 399 or fewer beds, 6.7 (5.9-7.4) for 24 hospitals with 400-799 beds, and 7.6 (6.7-8.5) for 18 hospitals with 800 or more beds (p-trend<0.01). NSIs frequently occurred in health care workers in their 20 s; the NSI incidence rate for this age group was 2.1 (1.6-2.5) for hospitals having 399 or fewer beds, 3.5 (3.0-4.1) for hospitals with 400-799 beds, and 4.5 (3.9-5.0) for hospitals with 800 or more beds (p-trend<0.01). The incidence rate of NSIs tended to be higher for larger hospitals and in workers aged less than 40 years; injury occurrence was more likely to occur in places such as patient rooms and operating rooms. Application of the NSI incidence rates by hospital size, as a benchmark, could allow individual hospitals to compare their NSI incidence rates with those of other institutions, which could facilitate the development of adequate control strategies. Source


Morishima M.,Shinshu University | Kishida K.,The Institute for Science of Labour | Uozumi T.,Muroran Institute of Technology | Kamijo M.,Shinshu University
International Journal of Clothing Science and Technology | Year: 2014

Purpose-In Japan, one of the countermeasures used to avoid the symptoms of hay fever (HF) is a hygiene mask; however, a mask can cause discomfort. The authors believe that co-occurrence analysis, which has been widely in the sciences, will be valuable to this issue. The purpose of this paper is to identify problems associated with the use of hygiene masks and recommend improvements in their function and comfort. The goal of this study was to obtain information for the development of effective hygiene masks for HF sufferers and therefore, improve their quality of life. Design/methodology/approach-The authors conducted a survey of university students with HF (n¼1,519) to identify problems with hygiene masks. Students completed self-report questionnaires and co-occurrence analyses were used to examine the data from a holistic perspective. Moreover, technical data, relative to the problems of wearing a mask were acquired experimentally using thermal, hygroscopic, and airflow properties. Findings-Among Japanese university students, hygiene masks were the most popular countermeasure against HF symptoms. In addition, it was found that wearing a mask was not influenced of the type of symptoms. Most problems were related to the masks’ thermal, hygroscopic, and airflow properties. Originality/value-The paper proposed the use of co-occurrence analysis to analyze problems with hygiene masks. Most problems appear to be related to the thermal, hygroscopic, and airflow properties of the masks. Moreover, such phenomena have been experimentally demonstrated. © Emerald Group Publishing Limited. Source


Itoh H.,Japanese National Institute for Occupational Safety and Health | Mori I.,The Institute for Science of Labour | Matsumoto Y.,Japanese National Institute for Occupational Safety and Health | Maki S.,Japanese National Institute for Occupational Safety and Health | Ogawa Y.,Japanese National Institute for Occupational Safety and Health
Industrial Health | Year: 2011

Seasonal variation in circulating 25-hydroxyvitamin D (25OHD) levels related to seasonal and inter-day fluctuation in sunlight ultraviolet irradiation, may lead to misjudgments concerning 25OHD status in individual workers around threshold levels. Here, to examine seasonal and inter-day variations in plasma 25OHD, we conducted a longitudinal study involving indoor daytime workers. Subjects were four male indoor daytime workers aged 32-57 yr working in Kawasaki City, Japan. Blood samples were obtained on six days within two twoweek periods in February and October, 2008. Plasma 25OHD, serum intact parathyroid hormone (PTH) and 1α,25-dihydroxyvitamin D [1α,25(OH) 2D] were measured. Individual monthly mean 25OHD levels were 16-56% higher in October than in February (p=0.03), while individual monthly mean intact PTH levels were 15-41% lower in October (p=0.09). No seasonal change was observed in 1α,25(OH) 2D (p=0.62). Notably, nearly all measured 25OHD levels in February were lower than the reference value of 20 ng/ml. Our study identified the occurrence of seasonal variation in circulating 25OHD and intact PTH levels, even after accounting for inter-day variability, and hypovitaminosis D in wintertime in indoor daytime male workers in Japan. Due to this variability, single spot measurements of 25OHD may lead to misjudgment of workers' vitamin D status. Source


Inoue A.,University of Occupational and Environmental Health Japan | Kawakami N.,University of Tokyo | Shimomitsu T.,Tokyo Medical University | Tsutsumi A.,Kitasato University | And 4 more authors.
Industrial Health | Year: 2014

This study was aimed to investigate the test-retest reliability and validity of a short version of the New Brief Job Stress Questionnaire (New BJSQ) whose scales have one item selected from a standard version. Based on the results from an anonymous web-based questionnaire of occupational health staffs and personnel/labor staffs, we selected higher-priority scales from the standard version. After selecting one item with highest item-total correlation coefficient from each scale, a 23-item questionnaire was developed. A nationally representative survey was administered to Japanese employees (n=1,633) to examine test-retest reliability and validity. Most scales (or items) showed modest but adequate levels of test-retest reliability (r>0.50). Furthermore, job demands and job resources scales (or items) were associated with mental and physical stress reactions while job resources scales (or items) were also associated with positive outcomes. These findings provided a piece of evidence that the short version of the New BJSQ is reliable and valid. © 2014 by National Institute of Occupational Safety and Health. Source

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