RT Journal Article SR Electronic T1 Fatigue among working people: validity of a questionnaire measure JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 353 OP 357 DO 10.1136/oem.57.5.353 VO 57 IS 5 A1 Beurskens, Anna J H M A1 Bültmann, Ute A1 Kant, IJmert A1 Vercoulen, Jan H M M A1 Bleijenberg, Gijs A1 Swaen, Gerard M H YR 2000 UL http://oem.bmj.com/content/57/5/353.abstract AB OBJECTIVES To evaluate the validity of the checklist individual strength questionnaire (CIS) in the working population. This 20 item self reported questionnaire has often been used in patients with chronic fatigue. To date, no research has focused on the validity of the CIS in occupational groups. METHODS To evaluate the discriminant validity the CIS was filled out by five groups of employees with expected differences in fatigue. The convergent validity was evaluated by comparing the results of the CIS with the results of three related measures: measured unidimensional fatigue, burnout, and need for recovery. RESULTS The CIS was able to discriminate between fatigued and non-fatigued employees in occupational groups. The expected agreement between the results of the CIS and related measures was confirmed. CONCLUSIONS The CIS seems to be an appropriate instrument for measuring fatigue in the working population.