Diagnostic Accuracy of the Work Functioning Impairment Scale (WFun)

Nagata, Tomohisa; Fujino, Yoshihisa; Saito, Kazutomo; Uehara, Masamichi; Oyama, Ichiro; Hayashi, Izumi; Kubo, Toshikazu

doi:10.1097/jom.0000000000001025

Cited by 37 publications

(31 citation statements)

References 14 publications

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“…We previously developed and validated a self-administered questionnaire using the work functioning impairment scale (WFun) for assessment 18 . We also verified that the results of WFun assessments were correlated with the results of fit-to-work assessments conducted by occupational health nurses 19 .…”

Section: Introductionsupporting

confidence: 71%

“…A higher total suggests greater work functioning impairment due to health problems. A total of ≥ 21 points suggests severely impaired work functioning: a previous study found approximately 20% of employees had a WFun score of 21 points, and an assessment by occupational health nurses found these people were likely to have severely impaired work functioning and that they demonstrated high detectability with an area under the ROC curve of 0.83 19 . Cronbach’s alpha coefficient for the seven items of WFun was 0.92 in this study.…”

Section: Methodsmentioning

confidence: 99%

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Work functioning impairment in the course of pharmacotherapy treatment for depression

Nagata

Fujino

Ohtani

et al. 2020

Sci Rep

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This study investigated the association between the duration of pharmacotherapy treatment for depression, or discontinuation from treatment, and work functioning impairment. This was a retrospective cohort study examining 30,409 workers. Work functioning impairment was assessed using a questionnaire, and treatment status was assessed using medical claims data. Odds ratios (ORs) of workers with severe work functioning impairment compared with healthy workers (control group) were calculated using logistic regression analysis. Continuous medical treatment was associated with severely impaired work functioning regardless of treatment period [continuous medical treatment; 4 months <: OR = 3.2, 4 months ≥, 10 months <: OR = 2.6, 10 months ≥, 14 months <: OR = 2.3, 14 months ≥, 16 months <: OR = 2.3, which are all statistically significant (p < 0.05)]. Workers who initially received pharmacotherapy treatment but discontinued in < 11 months had a significantly higher OR (treatment discontinuation period; 3 months <: OR = 2.3, 3 months ≥, 8 months <; OR = 2.0, 8 months ≥, 11 months <; OR = 3.0), while those who discontinued at ≥ 11 months did not (OR = 1.4, 95% CI 0.6–3.5). The sensitivity analysis excluding participants with at least one psychiatric comorbidity other than depression did not change the final result. It is important for the occupational health practitioners and attending psychiatrists to follow up in cooperation with each other, paying attention to the decrease in work functioning in addition to the symptoms.

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Section: Introductionsupporting

confidence: 71%

Section: Methodsmentioning

confidence: 99%

Work functioning impairment in the course of pharmacotherapy treatment for depression

Nagata

Fujino

Ohtani

et al. 2020

Sci Rep

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“…The score was calculated only when a respondent endorsed any of 13 chronic conditions 35 ) . The WFun is a seven item self-rated scale to measure work performance on the job at present, developed and validated in Japan 13 , 14 , 36 ) . The total score of WFun ranged from 4 to 28, with higher scores being indicative of greater presenteeism.…”

Section: Methodsmentioning

confidence: 99%

“…In Japan, absenteeism and presenteeism of workers due to health problems is a concern both for occupational health and productivity loss 10 ) . Well-established instruments of absenteeism and presenteeism, such as the Stanford Presenteeism Scale (SPS) 11 ) and Work Limitation Questionnaire (WLQ) 12 ) have been translated and tested for the reliability and validity in Japan 13 , 14 , 15 ) . Some instruments, such as Work Functioning Impairment Scale (WFun), were developed even originally in Japan 14 ) and extensively used in other countries 16 ) .…”

Section: Introductionmentioning

confidence: 99%

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Construct validity and test-retest reliability of the World Mental Health Japan version of the World Health Organization Health and Work Performance Questionnaire Short Version: a preliminary study

et al. 2020

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The aim of the study was to investigate test-retest reliability and construct validity of the World Mental Health Japan (WMHJ) version of WHO-HPQ according the COSMIN standard. We conducted two consecutive surveys of 102 full-time employees recruited through an Internet survey company in Japan, with a two-week interval in 2018. We calculated Pearson's correlation (r) of measures of the WHO-HPQ with other presenteeism scales (SPS, WFun, and perceived relative presenteeism), health and psychosocial job conditions. We tested the test-retest reliability (intraclass correlation, ICC) among those who reported no change of job performance during the follow-up. Among 92 (90%) respondents, the absolute presenteeism significantly correlated with WFun and perceived relative presenteeism (r= -0.341 and -0.343, respectively, p<0.01) and psychological distress (r=-0.247, p=0.018). The absolute/relative absenteeism did not significantly correlate with the covariates. The test-retest reliability over a two-week period was high for the WHO-HPQ absolute presenteeism (ICC, 0.73), while those for absolute/relative absenteeism measures were moderate. The study found an adequate level of test-retest reliability, but limited support for the construct validity of the absolute presenteeism measure of the WMHJ version of the WHO-HPQ. Further research is needed to investigate the construct validity of the WHO-HPQ measures in a larger sample.

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Cross-cultural validation of the work functioning impairment scale (WFun) among Japanese, English, and Chinese versions using Rasch analysis

Fujino

Liu

Chimed‐Ochir

et al. 2019

Journal of Occupational Health

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Objectives The work functioning impairment scale (WFun) was developed to measure the degree of work functioning impairment in Japanese workers based on the Rasch model. Given that the number of foreign workers employed in Japan and abroad has increased in recent years, a multilingual questionnaire is becoming increasingly necessary to investigate work functioning impairment in these workers. The purpose of this study was to verify the cross‐cultural validity of WFun between Japanese, Chinese, and English versions. Methods A cross‐sectional study was conducted in two stages. First, the Chinese and English versions of WFun were created. Second, an internet survey was conducted among 1000 Japanese, 400 Chinese, and 300 Americans. Estimates and standard errors of an individual's ability and item difficulty were calculated using the Rasch model. Differential item functioning (DIF) and differential test functioning (DTF) were also examined using Rasch model analyses. Results The effect size of DIF for one item in the English version exceeded 0.5 logit, indicating the presence of some DIF. In contrast, the effect sizes of DIF for all other items were below 0.5 logit, indicating that the influence of DIF was negligible. Furthermore, Rasch measurements according to the raw score for each version of WFun showed strong agreement among the three versions, with an intraclass correlation of 0.98 (95% confidence interval: 0.97‐0.99), indicating the absence of DTF. Conclusions Our findings indicate that the English, Chinese, and Japanese versions of WFun have good comparability.

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Diagnostic Accuracy of the Work Functioning Impairment Scale (WFun)

Abstract: This study suggests that the WFun is useful in detecting those who have health problems affecting their work.

Cited by 37 publications

References 14 publications

Work functioning impairment in the course of pharmacotherapy treatment for depression

Work functioning impairment in the course of pharmacotherapy treatment for depression

Construct validity and test-retest reliability of the World Mental Health Japan version of the World Health Organization Health and Work Performance Questionnaire Short Version: a preliminary study

Cross-cultural validation of the work functioning impairment scale (WFun) among Japanese, English, and Chinese versions using Rasch analysis

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