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Chikusa ku, Japan

Osada K.,St. Marianna University School of Medicine | Oka H.,St. Marianna University School of Medicine | Isomura T.,Clinical Study Support Inc. | Nakamura I.,Argenes Inc. | And 4 more authors.
International Journal of Rheumatic Diseases | Year: 2011

Aim: To perform a psychometric assessment of the Japanese version of the Fibromyalgia Impact Questionnaire (JFIQ). Methods: Data for the psychometric assessment were collected from Japanese fibromyalgia (FM) patients who visited a clinic. Analyses were performed to examine the reliability and validity of the JFIQ. Results: A total of 56 patients were included in the analysis. There was no remarkable floor or ceiling effect for the JFIQ item or total scores. In the analysis of reproducibility, the interclass correlation coefficients of each item score and total score ranged from 0.61 to 0.95. Cronbach's alpha coefficient was 0.92. For the concurrent validity, the total score and most of the item scores correlated to every domain of Short Form-36 or Beck Depression Inventory-II to a moderate or great extent. The results of the known-group comparisons indicated that the total score tended to increase with the increase in severity of FM and pain (P-values for trend <0.05). Conclusion: This psychometric assessment demonstrated good reliability and validity of the JFIQ for use with Japanese FM patients. In the future, we expect that this questionnaire will be used in clinical studies and medical practice, and will be beneficial in the development of new therapies as well as for the comprehensive evaluation of patients' conditions in Japan. © 2011 The Authors. International Journal of Rheumatic Diseases © 2011 Asia Pacific League of Associations for Rheumatology and Blackwell Publishing Asia Pty Ltd.

Matsudaira K.,Clinical Research Center for Occupational Musculoskeletal Disorders | Hara N.,University of Tokyo | Arisaka M.,Clinical Research Center for Occupational Musculoskeletal Disorders | Isomura T.,Clinical Study Support Inc.
Industrial Health | Year: 2011

To assess the effects of physician's advice on non-specific acute low back pain (ALBP) in Japanese workers, existing data from a prospective, epidemiological study of Japanese workers were analyzed. Among workers who had had low back strain during the past year at baseline and responded to the 1-yr follow-up survey (n=475), those who obtained medical care (n=255) and received advice either to rest (n=68 for the rest group) or to stay active (n=32 for the active group) were examined. The rest group seemed to have a higher risk of ALBP than the active group after adjusting for age, gender, history of low back strain, type of physical activity at work, and severity of LBP during the past month at baseline (adjusted OR for the rest group vs. the active group: 3.65, 95%CI: 0.96-13.8). Compared to the active group, low back strain was more likely to occur repeatedly and to become chronic in the rest group. These findings suggest that advice to rest may not be better than advice to stay active for preventing future episodes of ALBP in Japanese workers, which is consistent with previous studies or guidelines for the management of ALBP in Western countries.

Matsudaira K.,Clinical Research Center for Occupational Musculoskeletal Disorders | Isomura T.,Clinical Study Support Inc. | Miyoshi K.,Yokohama Rosai Hospital | Okazaki H.,Kanto Rosai Hospital | Konishi H.,Nagasaki Rosai Hospital
Nihon rinsho. Japanese journal of clinical medicine | Year: 2014

Low back pain (LBP) is a common musculoskeletal health problem in industrialized countries and one of the worst leading specific causes of years lived with disability. We conducted a cohort study specifically targeting Japanese workers. Results suggest that psychosocial factors such as low job satisfaction, little social support, depression, and somatization are important risk factors for aggravating LBP and are consistent with foreign studies despite cultural differences. Additionally, neck and shoulder discomfort ("katakori" in Japanese) is common among Japanese adults, especially females. Psychosocial stress is likely to trigger brain dysfunction, leading to depression and somatization. Our data suggests a new concept of LBP and "katakori" as a form of somatization, possibly derived from psychological stress.

Matsudaira K.,Clinical Research Center for Occupational Musculoskeletal Disorders | Konishi H.,Nagasaki Rosai Hospital | Miyoshi K.,Spine Center | Isomura T.,Clinical Study Support Inc. | And 4 more authors.
Spine | Year: 2012

Study Design: Two-year, prospective cohort data from the Japan epidemiological research of occupation-related back pain study were used for this analysis. Objective: To examine the association between a new onset of low back pain (LBP) with disability and potential risk factors among initially symptom-free Japanese workers. Summary of Background Data: Despite strong evidence that psychosocial issues may influence LBP onset among symptom-free persons, these and other LBP risk factors have not been well investigated in the Japanese workplace. Methods: Of 5310 participants responding to a self-administered baseline questionnaire (response rate: 86.5%), 3194 (60.2%) completed both 1- and 2-year follow-up questionnaires. The baseline questionnaire assessed individual characteristics, ergonomic work demands, and work-related psychosocial factors. The outcome of interest was new-onset LBP with disability during the follow-up period. Incidence was calculated for the participants who reported no LBP during the past year at baseline. Logistic regression was used to explore risk factors associated with new-onset LBP with disability. Results: Of 836 participants who were symptom-free during the preceding year, 33 (3.9%) reported LBP with disability during the 2-year follow-up. In univariate analyses, "history of LBP," "frequent lifting," "interpersonal stress at workplace," and "monotonous tasks" were all significant predictors of LBP incidence. All of these factors remained statistically significant or almost significant in the multivariate analysis adjusting for the other variables as well as age and sex: adjusted odds ratio (OR) and 95% confidence interval (95% CI) for history of LBP (OR: 3.25, 95% CI: 1.53-6.91), frequent lifting (OR: 3.77, 95% CI: 1.16-12.3), interpersonal stress at workplace (OR: 2.42, 95% CI: 1.08-5.43), and monotonous tasks (OR: 2.21, 95% CI: 0.99-4.94). Conclusion: Both ergonomic and work-related psychosocial factors may predict the development of LBP with disability among previously asymptomatic Japanese workers. Thus, workplace interventions aimed at reducing the incidence of LBP should focus on both ergonomic and psychosocial stress. Copyright © 2012 Lippincott Williams & Wilkins.

Matsudaira K.,Clinical Research Center for Occupational Musculoskeletal Disorders | Kikuchi N.,Clinical Study Support Inc. | Murakami A.,Clinical Study Support Inc. | Isomura T.,Clinical Study Support Inc.
Journal of Orthopaedic Science | Year: 2014

Background; The Fear-Avoidance Beliefs Questionnaire (FABQ) is useful for measuring fear-avoidance beliefs in patients with low back pain (LBP); however, no psychometrically validated Japanese version is available. The objective of this study was to evaluate reliability and validity of the Japanese version of the FABQ for use with Japanese workers with LBP. Methods: This was conducted as a web-based survey. Both confirmatory and exploratory factor analysis were performed to examine domain structure of the Japanese version of the FABQ. For reliability, internal consistency was assessed with Cronbach's alpha coefficient. For concurrent validity, correlation coefficients between the FABQ and the Pain Catastrophizing Scale (PCS) were calculated. For known-group validity, the relationship between FABQ score and clinical variables such as pain and depression was examined. Results: Analyses were based on responses of 1,786 adult Japanese workers with LBP. Factor analysis using the principal factor method with promax rotation revealed two factors, work and physical activity, in accordance with the domain structure of the original version of the scale. For reliability, acceptable internal consistency was demonstrated with Cronbach's alpha coefficient of 0.882 and 0.783 for each subscale. For concurrent validity, significantly moderate correlations were demonstrated between FABQ subscales and PCS subscales (r = 0.30-0.39). For known-group validity, as hypothesized, significantly higher FABQ subscale scores were observed in workers who had stronger pain, who experienced routine work disability with sick leave, who experienced recurrence of LBP, and who had depressed mood. Conclusions: This analysis showed that the Japanese version of the FABQ is psychometrically reliable and valid to detect fear-avoidance beliefs in Japanese workers with LBP. © The Japanese Orthopaedic Association 2013.

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