Work functioning measurement: Tools for occupational mental health research

Journal of Occupational and Environmental Medicine

Volumn 52, Issue 8, 2010, Pages 778-790

  Nieuwenhuijsen, Karen ^a   Franche, Renée Louise ^b,c,d,e   Van Dijk, Frank J H ^a  

^a UNIVERSITY OF AMSTERDAM   (Netherlands)

^b UNIVERSITY OF BRITISH COLUMBIA   (Canada)

^c SIMON FRASER UNIVERSITY   (Canada)

^d INSTITUTE FOR WORK AND HEALTH   (Canada)

^e UNIVERSITY OF TORONTO   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

ANXIETY DISORDER; CASE FINDING; CLINICAL ASSESSMENT TOOL; CONSTRUCT VALIDITY; CONTENT VALIDITY; CRITERION RELATED VALIDITY; DEPRESSION; ENDICOTT WORK PRODUCTIVITY SCALE; HEALTH AND LABOR QUESTIONNAIRE; HEALTH AND WORK PERFORMANCE QUESTIONNAIRE; HEALTH AND WORK QUESTIONNAIRE; HEALTH RELATED PRODUCTIVITY QUESTIONNAIRE DIARY; HUMAN; INTERNAL CONSISTENCY; LIEBOWITZ DISABILITY SELF RATING SCALE; LONGITUDINAL INTERVAL FOLLOW UP EVALUATION SUBSCALES FOR OCCUPATIONAL FUNCTIONING; MENTAL HEALTH RESEARCH; NAMED INVENTORIES, QUESTIONNAIRES AND RATING SCALES; NATIONAL INSTITUTE OF MENTAL HEALTH PANIC QUESTIONNAIRE; OCCUPATIONAL FUNCTIONING SCALE; OCCUPATIONAL HEALTH; OSTERHAUS; PRODUCTIVITY; PSYCHOMETRY; QUALITY CONTROL; QUANTITY AND QUALITY METHOD; RELIABILITY; REVIEW; SOCIAL ADJUSTMENT SCALE SELF REPORT; STANFORD PRESENTEEISM SCALE; TEST RETEST RELIABILITY; WORK AND HEALTH INTERVIEW; WORK CAPACITY; WORK FUNCTIONING; WORK LIMITATIONS QUESTIONNAIRE; WORK PRODUCTIVITY AND ACTIVITY IMPAIRMENT QUESTIONNAIRE GENERAL HEALTH; WORK ROLE FUNCTIONING MEASURE; WORKER PRODUCTIVITY INDEX; WORKER PRODUCTIVITY SHORT INVENTORY;

EID: 77955853895     PISSN: 10762752     EISSN: None     Source Type: Journal    
DOI: 10.1097/JOM.0b013e3181ec7cd3     Document Type: Article

References (115)

1. European Agency on Safety and Health at Work. Expert Forecast on Emerging Psychosocial Risks Related to Occupational Safety and Health. Brussels, Belgium: European Agency on Safety and Health at Work; 2007.
2. Parent-Thirion A, Fernández ME, Hurley J, Vermeylen G. Fourth European Working Conditions Survey. Dublin, Ireland: European Foundation; 2007.
3. Sanderson K, Andrews G. Common mental disorders in the workforce: recent findings from descriptive and social epidemiology. Can J Psychiatry. 2006;51:63-75.
4. Glozier N. Mental ill health and fitness for work. Occup Environ Med. 2002;59:714-720.
5. Fryers T, Melzer D, Jenkins R. Social inequalities and the common mental disorders: a systematic review of the evidence. Soc Psychiatry Psychiatr Epidemiol. 2003;38:229-237.
6. Stansfeld S, Feeney A, Head J, Canner R, North F, Marmot M. Sickness absence for psychiatric illness: the Whitehall II Study. Soc Sci Med. 1995;40:189-197.
7. Lerner D, Henke RM. What does research tell us about depression, job performance, and work productivity? J Occup Environ Med. 2008;50:401-410.
8. Laitinen-Krispijn S, Bijl RV. Mental disorders and employee sickness absence: the NEMESIS study. Netherlands Mental Health Survey and Incidence Study. Soc Psychiatry Psychiatr Epidemiol. 2000;35:71-77.
9. Alonso J, Angermeyer MC, Bernert S, et al; ESEMeD/MHEDEA 2000 Investigators, European Study of the Epidemiology of Mental Disorders (ESEMeD) Project. Disability and quality of life impact of mental disorders in Europe: results from the European Study of the Epidemiology of Mental Disorders (ESEMeD) project. Acta Psychiatr Scand Suppl. 2004;(420):38-46.
10. Amick BC III, Gimeno D. Measuring work outcomes with a focus on health-related productivity loss. In: Wittink H, Carr D, eds. Evidence, Outcomes & Quality of Life in Pain Treatment: A Handbook for Pain Treatment Professionals. London, UK: Elsevier; 2007.
11. Goetzel RZ, Ozminkowski RJ, Sederer LI, Mark TL. The business case for quality mental health services: why employers should care about the mental health and well-being of their employees. J Occup Environ Med. 2002;44: 320-330.
12. Stewart WF, Ricci JA, Chee E, Hahn SR, Morganstein D. Cost of lost productive work time among US workers with depression. JAMA. 2003; 289:3135-3144. (Pubitemid 37432889)
13. Waghorn G, Chant D. Work performance among Australians with depression and anxiety disorders: a population level second order analysis. J Nerv Ment Dis. 2006;194:898-904.
14. Lerner D, Adler DA, Chang H, et al. Unemployment, job retention, and productivity loss among employees with depression. Psychiatr Serv. 2004; 55:1371-1378.
15. Adler DA, McLaughlin TJ, Rogers WH, Chang H, Lapitsky L, Lerner D. Job performance deficits due to depression. Am J Psychiatry. 2006;163: 1569-1576.
16. Yassi A, Hancock T. Patient safety-worker safety: building a culture of safety to improve healthcare worker and patient well-being. Healthc Q. 2005;8 Spec No:32-38.
17. Suzuki K, Ohida T, Kaneita Y, et al. Mental health status, shift work, and occupational accidents among hospital nurses in Japan. J Occup Health. 2004;46:448-454.
18. Chambers R, George V, McNeill A, Campbell I. Health at work in the general practice. Br J Gen Pract. 1998;48:1501-1504.
19. Haslam C, Atkinson S, Brown SS, Haslam RA. Anxiety and depression in the workplace: effects on the individual and organisation (a focus group investigation). J Affect Disord. 2005;88:209-215.
20. Haslam C, Atkinson S, Brown S, Haslam RA. Perceptions of the impact of depression and anxiety and the medication for these conditions on safety in the workplace. Occup Environ Med. 2005;62:538-545.
21. Dewa CS, Lin E. Chronic physical illness, psychiatric disorder and disability in the workplace. Soc Sci Med. 2000;51:41-50.
22. Simon GE, Barber C, Birnbaum HG, et al. Depression and work productivity: the comparative costs of treatment versus nontreatment. J Occup Environ Med. 2001;43:2-9.
23. Hirschfeld RM, Montgomery SA, Keller MB, et al. Social functioning in depression: a review. J Clin Psychiatry. 2000;61:268-275.
24. Nieuwenhuijsen K, Bultmann U, Neumeyer-Gromen A, Verhoeven AC, Verbeek JH, van der Feltz-Cornelis CM. Interventions to improve occupational health in depressed people. Cochrane Database Syst Rev. 2008;(2): CD006237.
25. Schene AH, Koeter MW, Kikkert MJ, Swinkels JA, McCrone P. Adjuvant occupational therapy for work-related major depression works: randomized trial including economic evaluation. Psychol Med. 2007;37:351-362.
26. Verbeek J, Husman K, van DF, Jauhiainen M, Pasternack I, Vainio H. Building an evidence base for occupational health interventions. Scand J Work Environ Health. 2004;30:164-170.
27. Haynes SN, Richard DC, Kubany ES. Content validity in psychological assessment: a functional approach to concepts and methods. Psychol Assess. 1995;3:238-247.
28. Lofland JH, Pizzi L, Frick KD. A review of health-related workplace productivity loss instruments. Pharmacoeconomics. 2004;22:165-184.
29. Prasad M, Wahlqvist P, Shikiar R, Shih YC. A review of self-report instruments measuring health-related work productivity: a patient-reported outcomes perspective. Pharmacoeconomics. 2004;22:225-244.
30. Campbell M, Fitzpatrick R, Haines A, et al. Framework for design and evaluation of complex interventions to improve health. BMJ. 2000;321: 694-696.
31. Goldenhar LM, LaMontagne AD, Katz T, Heaney C, Landsbergis P. The intervention research process in occupational safety and health: an overview from the National Occupational Research Agenda Intervention Effectiveness Research team. J Occup Environ Med. 2001;43:616-622.
32. Bartholomew LK, Parcel GS, Kok G, Gottlieb NH. Planning Health Promotion Programs. San Francisco, CA: Jossey-Bass; 2006.
33. Salyers MP, Bosworth HB, Swanson JW, Lamb-Pagone J, Osher FC. Reliability and validity of the SF-12 health survey among people with severe mental illness. Med Care. 2000;38:1141-1150.
34. Sheehan DV, Harnett-Sheehan K, Raj BA. The measurement of disability. Int Clin Psychopharmacol. 1996;11(Suppl 3):89-95.
35. Goldman HH, Skodol AE, Lave TR. Revising axis V for DSM-IV: a review of measures of social functioning. Am J Psychiatry. 1992;149:1148-1156.
36. Mundt JC, Marks IM, Shear MK, Greist JH. The Work and Social Adjustment Scale: a simple measure of impairment in functioning. Br J Psychiatry. 2002;180:461-464.
37. Adler DA, Irish J, McLaughlin TJ, et al. The work impact of dysthymia in a primary care population. Gen Hosp Psychiatry. 2004;26:269-276.
38. Allgulander C, Dahl AA, Austin C, et al. Efficacy of sertraline in a 12-week trial for generalized anxiety disorder. Am J Psychiatry. 2004;161:1642-1649.
39. Allgulander C, Jorgensen T, Wade A, et al. Health-related quality of life (HRQOL) among patients with Generalised Anxiety Disorder: evaluation conducted alongside an escitalopram relapse prevention trial. Curr Med Res Opin. 2007;23:2543-2549.
40. Lerner D, Adler DA, Chang H, et al. The clinical and occupational correlates of work productivity loss among employed patients with depression. J Occup Environ Med. 2004;46:S46-S55.
41. Martin JK, Blum TC, Beach SR, Roman PM. Subclinical depression and performance at work. Soc Psychiatry Psychiatr Epidemiol. 1996;31:3-9.
42. Wang PS, Beck AL, Berglund P, et al. Effects of major depression on moment-in-time work performance. Am J Psychiatry. 2004;161:1885-1891.
43. Akhondzadeh S, Naghavi HR, Vazirian M, Shayeganpour A, Rashidi H, Khani M. Passionflower in the treatment of generalized anxiety: a pilot double-blind randomized controlled trial with oxazepam. J Clin Pharm Ther. 2001;26:363-367. (Pubitemid 32989558)
44. Angst J, Gamma A, Pezawas L, et al. Parsing the clinical phenotype of depression: the need to integrate brief depressive episodes. Acta Psychiatr Scand. 2007;115:221-228.
45. Carpenter LL, Milosavljevic N, Schecter JM, Tyrka AR, Price LH. Augmentation with open-label atomoxetine for partial or nonresponse to antidepressants. J Clin Psychiatry. 2005;66:1234-1238.
46. Colombi AM. Depression Management in the workplace: a case study. J Manag Care Pharm. 2005;11:S16-S20.
47. Davidson J, Yaryura-Tobias J, DuPont R, et al. Fluvoxamine-controlled release formulation for the treatment of generalized social anxiety disorder. J Clin Psychopharmacol. 2004;24:118-125.
48. Druss BG, Schlesinger M, Allen HM Jr. Depressive symptoms, satisfaction with health care, and 2-year work outcomes in an employed population. Am J Psychiatry. 2001;158:731-734.
49. Eisen JL, Mancebo MA, Pinto A, et al. Impact of obsessive-compulsive disorder on quality of life. Compr Psychiatry. 2006;47:270-275.
50. Esposito E, Wang JL, Williams JV, Patten SB. Mood and anxiety disorders, the association with presenteeism in employed members of a general population sample. Epidemiol Psichiatr Soc. 2007;16:231-237.
51. Evans S, Patt I, Giosan C, Spielman L, Difede J. Disability and posttraumatic stress disorder in disaster relief workers responding to September 11, 2001 World Trade Center disaster. J Clin Psychol. 2009;65:684-694.
52. Ferrero A, Piero A, Fassina S, et al. A 12-month comparison of brief psychodynamic psychotherapy and pharmacotherapy treatment in subjects with generalised anxiety disorders in a community setting. Eur Psychiatry. 2007;22:530-539.
53. Geuze E, Vermetten E, de Kloet CS, Hijman R, Westenberg HG. Neuropsychological performance is related to current social and occupational functioning in veterans with posttraumatic stress disorder. Depress Anxiety. 2009;26:7-15.
54. Gilmour H, Patten SB. Depression and work impairment. Health Rep. 2007;18:9-22.
55. Hedges DW, Brown BL, Shwalb DA, Godfrey K, Larcher AM. The efficacy of selective serotonin reuptake inhibitors in adult social anxiety disorder: a meta-analysis of double-blind, placebo-controlled trials. J Psychopharmacol. 2007;21:102-111.
56. Hidalgo RB, Ross J, Davidson JR. Obsessive-compulsive disorder in callers to the Anxiety Disorders Association of America. Ann Clin Psychiatry. 2006;18:157-162. (Pubitemid 44576436)
57. Hilsenroth MJ, Ackerman SJ, Blagys MD, Baity MR, Mooney MA. Short-term psychodynamic psychotherapy for depression: an examination of statistical, clinically significant, and technique-specific change. J Nerv Ment Dis. 2003;191:349-357.
58. Hourani LL, Williams TV, Kress AM. Stress, mental health, and job performance among active duty military personnel: findings from the 2002 Department of Defense Health-Related Behaviors Survey. Mil Med. 2006; 171:849-856.
59. Judd LL, Schettler PJ, Solomon DA, et al. Psychosocial disability and work role function compared across the long-term course of bipolar I, bipolar II and unipolar major depressive disorders. J Affect Disord. 2008;108:49-58.
60. Kennedy BL, Lin Y, Schwab JJ. Work, social, and family disabilities of subjects with anxiety and depression. South Med J. 2002;95:1424-1427.
61. Knekt P, Lindfors O, Laaksonen MA, Raitasalo R, Haaramo P, Jarvikoski A. Effectiveness of short-term and long-term psychotherapy on work ability and functional capacity-a randomized clinical trial on depressive and anxiety disorders. J Affect Disord. 2008;107:95-106.
62. Latas M, Starcevic V, Vucinic D. Predictors of work disabilities in patients with panic disorder with agoraphobia. Eur Psychiatry. 2004;19:280-284.
63. Mavissakalian MR, Zamar N. Generalized anxiety disorder versus panic disorder: participation in controlled efficacy trials. Compr Psychiatry. 2000;41:253-258.
64. Michon HW, Ten HM, Kroon H, van WJ, de GR, Schene AH. Mental disorders and personality traits as determinants of impaired work functioning. Psychol Med. 2008;38:1627-1637.
65. Muhonen LH, Lonnqvist J, Juva K, Alho H. Double-blind, randomized comparison of memantine and escitalopram for the treatment of major depressive disorder comorbid with alcohol dependence. J Clin Psychiatry. 2008;69:392-399.
66. Papakostas GI, Petersen T, Mischoulon D, et al. Functioning and interpersonal relationships as predictors of response in treatment-resistant depression. Compr Psychiatry. 2003;44:44-50.
67. Pjrek E, Willeit M, Praschak-Rieder N, et al. Treatment of seasonal affective disorder with duloxetine: an open-label study. Pharmacopsychiatry. 2008;41:100-105.
68. Rytsala HJ, Melartin TK, Leskela US, Sokero TP, Lestela-Mielonen PS, Isometsa ET. Predictors of long-term work disability in Major Depressive Disorder: a prospective study. Acta Psychiatr Scand. 2007;115:206-213.
69. Salminen JK, Karlsson H, Hietala J, et al. Short-term psychodynamic psychotherapy and fluoxetine in major depressive disorder: a randomized comparative study. Psychother Psychosom. 2008;77:351-357.
70. Schwenk TL, Gorenflo DW, Leja LM. A survey on the impact of being depressed on the professional status and mental health care of physicians. J Clin Psychiatry. 2008;69:617-620.
71. Waghorn G, Chant D, White P, Whiteford H. Disability, employment and work performance among people with ICD-10 anxiety disorders. Aust N Z J Psychiatry. 2005;39:55-66.
72. Waghorn G, Chant D. Receiving treatment and labor force activity in a community survey of people with anxiety and affective disorders. J Occup Rehabil. 2007;17:623-640.
73. Wisniewski SR, Rush AJ, Bryan C, et al. Comparison of quality of life measures in a depressed population. J Nerv Ment Dis. 2007;195:219-225.
74. Wittchen HU, Fuetsch M, Sonntag H, Muller N, Liebowitz M. Disability and quality of life in pure and comorbid social phobia. Findings from a controlled study. Eur Psychiatry. 2000;15:46-58.
75. Berndt ER, Bailit HL, Keller MB, Verner JC, Finkelstein SN. Health care use and at-work productivity among employees with mental disorders. Health Aff (Millwood). 2000;19:244-256.
76. Buist-Bouwman MA, Ormel J, de Graaf R, et al. Mediators of the association between depression and role functioning. Acta Psychiatr Scand. 2008;118:451-458.
77. Demyttenaere K, Bonnewyn A, Bruffaerts R, Brugha T, de Graaf R, Alonso J. Comorbid painful physical symptoms and depression: prevalence, work loss, and help seeking. J Affect Disord. 2006;92:185-193.
78. Kessler RC, Akiskal HS, Ames M, et al. Prevalence and effects of mood disorders on work performance in a nationally representative sample of U.S. workers. Am J Psychiatry. 2006;163:1561-1568.
79. Lo Sasso AT, Rost K, Beck A. Modeling the impact of enhanced depression treatment on workplace functioning and costs: a cost-benefit approach. Med Care. 2006;44:352-358.
80. Oloyede DO. Impact of work-induced stress on perceived workers' productivity in banking industry in lagos state. IFE Psychologia. 2006;14:15-25.
81. Rost K, Smith JL, Dickinson M. The effect of improving primary care depression management on employee absenteeism and productivity. A randomized trial. Med Care. 2004;42:1202-1210.
82. Rost KM. Improving depression treatment by integrated care. J Manag Care Pharm. 2005;11:S5-S8.
83. Stewart WF, Ricci JA, Chee E, Morganstein D. Lost productive work time costs from health conditions in the United States: results from the American Productivity Audit. J Occup Environ Med. 2003;45:1234-1246.
84. Wang PS, Simon GE, Avorn J, et al. Telephone screening, outreach, and care management for depressed workers and impact on clinical and work productivity outcomes: a randomized controlled trial. JAMA. 2007;298: 1401-1411.
85. Pflanz SE, Ogle AD. Job stress, depression, work performance, and perceptions of supervisors in military personnel. Mil Med. 2006;171:861-865.
86. de Graaf R, Kessler RC, Fayyad J, et al. The prevalence and effects of adult attention-deficit/hyperactivity disorder (ADHD) on the performance of workers: results from the WHO World Mental Health Survey Initiative. Occup Environ Med. 2008;65:835-842.
87. Cimera RE, Cowan RJ. The costs of services and employment outcomes achieved by adults with autism in the US. Autism. 2009;13:285-302.
88. Schneier FR, Heckelman LR, Garfinkel R, et al. Functional impairment in social phobia. J Clin Psychiatry. 1994;55:322-331.
89. Quilty LC, Van AM, Mancini C, Oakman J, Farvolden P. Quality of life and the anxiety disorders. J Anxiety Disord. 2003;17:405-426.
90. Endicott J, Nee J. Endicott Work Productivity Scale (EWPS): a new measure to assess treatment effects. Psychopharmacol Bull. 1997;33:13-16.
91. Escorpizo R, Bombardier C, Boonen A, et al. Worker productivity outcome measures in arthritis. J Rheumatol. 2007;34:1372-1380.
92. Beaton D, Bombardier C, Escorpizo R, et al. Measuring worker productivity: frameworks and measures. J Rheumatol. 2009;36:2100-2109.
93. van Roijen L, Essink-Bot ML, Koopmanschap MA, Bonsel G, Rutten FF. Labor and health status in economic evaluation of health care. The Health and Labor Questionnaire. Int J Technol Assess Health Care. 1996;12:405-415.
94. Kessler RC, Barber C, Beck A, et al. The World Health Organization Health and Work Performance Questionnaire (HPQ). J Occup Environ Med. 2003;45:156-174.
95. Kessler RC, Ames M, Hymel PA, et al. Using the World Health Organization Health and Work Performance Questionnaire (HPQ) to evaluate the indirect workplace costs of illness. J Occup Environ Med. 2004;46:S23-S37.
96. Kumar RN, Hass SL, Li JZ, Nickens DJ, Daenzer CL, Wathen LK. Validation of the Health-Related Productivity Questionnaire Diary (HRPQ-D) on a sample of patients with infectious mononucleosis: results from a phase 1 multicenter clinical trial. J Occup Environ Med. 2003;45:899-907.
97. Shikiar R, Halpern MT, Rentz AM, Khan ZM. Development of the Health and Work Questionnaire (HWQ): an instrument for assessing workplace productivity in relation to worker health. Work. 2004;22:219-229.
98. Keller MB, Lavori PW, Friedman B, et al. The Longitudinal Interval Follow- up Evaluation. A comprehensive method for assessing outcome in prospective longitudinal studies. Arch Gen Psychiatry. 1987;44:540-548.
99. Bouchard S, Pelletier MH, Gauthier JG, Cote G, Laberge B. The assessment of panic using self-report: a comprehensive survey of validated instruments. J Anxiety Disord. 1997;11:89-111.
100. Hannula JA, Lahtela K, Jarvikoski A, Salminen JK, Makela P. Occupational Functioning Scale (OFS)-an instrument for assessment of work ability in psychiatric disorders. Nord J Psychiatry. 2006;60:372-378.
101. Kopec JA, Esdaile JM. Occupational role performance in persons with back pain. Disabil Rehabil. 1998;20:373-379.
102. Osterhaus JT, Gutterman DL, Plachetka JR. Healthcare resource and lost labour costs of migraine headache in the US. Pharmacoeconomics. 1992; 2:67-76.
103. Brouwer WB, Koopmanschap MA, Rutten FF. Productivity losses without absence: measurement validation and empirical evidence. Health Policy. 1999;48:13-27.
104. Weissman MM, Bothwell S. Assessment of social adjustment by patient self-report. Arch Gen Psychiatry. 1976;33:1111-1115.
105. Koopman C, Pelletier KR, Murray JF, et al. Stanford presenteeism scale: health status and employee productivity. J Occup Environ Med. 2002;44:14-20.
106. Sanderson K, Tilse E, Nicholson J, Oldenburg B, Graves N. Which presenteeism measures are more sensitive to depression and anxiety? J Affect Disord. 2007;101:65-74.
107. Gignac MA, Badley EM, Lacaille D, Cott CC, Adam P, Anis AH. Managing arthritis and employment: making arthritis-related work changes as a means of adaptation. Arthritis Rheum. 2004;51:909-916.
108. Lerner D, Amick BC III, Rogers WH, Malspeis S, Bungay K, Cynn D. The Work Limitations Questionnaire. Med Care. 2001;39:72-85.
109. Lerner D, Amick BC III, Lee JC, et al. Relationship of employee-reported work limitations to work productivity. Med Care. 2003;41:649-659.
110. Amick BC III, Lerner D, Rogers WH, Rooney T, Katz JN. A review of health-related work outcome measures and their uses, and recommended measures. Spine. 2000;25:3152-3160.
111. Reilly MC, Zbrozek AS, Dukes EM. The validity and reproducibility of a work productivity and activity impairment instrument. Pharmacoeconomics. 1993;4:353-365.
112. Loeppke R, Hymel PA, Lofland JH, et al. Health-related workplace productivity measurement: general and migraine-specific recommendations from the ACOEM Expert Panel. J Occup Environ Med. 2003;45: 349-359.
113. Burton WN, Conti DJ, Chen CY, Schultz AB, Edington DW. The role of health risk factors and disease on worker productivity. J Occup Environ Med. 1999;41:863-877.
114. Goetzel RZ, Ozminkowski RJ, Long SR. Development and reliability analysis of the Work Productivity Short Inventory (WPSI) instrument measuring employee health and productivity. J Occup Environ Med. 2003;45:743-762.
115. Ozminkowski RJ, Goetzel RZ, Long SR. A validity analysis of the Work Productivity Short Inventory (WPSI) instrument measuring employee health and productivity. J Occup Environ Med. 2003;45:1183-1195.