Table 6.

Occupational functioning measures

Measure	Source	Respa	Facetsb	Nitems	NDepStudies	Psychometrics
						α	rxx’
Employment	NA	Any	E	1	>250	NA
Absenteeism	NA	Any	A	1	>250	NA
SAS-SRc	Weissman and Bothwell (1976)	P	P	6	23
WHO-DAS II	Rehm et al. (1999)	Any	P	32d	17		.86
WAI	Tuomi, Ilmarinen, Jahkola, Katajarinne, and Tulkki (1998)	P	A,P	2	4		.72
EWPS	Endicott and Nee (1997)	P	P	25	3
SPS	Lynch and Riedel (2001)e	P	P	32	2
SPS	Turpin et al. (2004)	P	P	13	2	.82
WPI	Burton et al. (1999)	Many	A,P	2	1
SPS	Koopman et al. (2002)	P	P	3	1	.80
WLQ	Lerner et al. (2001)	P	P	48	1	.89–.96
WPAI	Reilly, Zbrozek, and Dukes (1993)	P	E,A,P	6	1		.71–.75
OFS	Hannula et al. (2006)	C	E,A,P	1	1	NA	.91

Measure abbreviations: SAS-SR: Social Adjustment Scale-Self-Report, WHO-DAS II: World Health Organization-Disability Assessment Scale, WAI: Work Ability Index, EWPS: Endicott Work Productivity Scale, SPS: Stanford Presenteeism Scale, WPI: Work Productivity Index, WLQ: Work Limitation Questionnaire, WPAI: Work Productivity and Activity Impairment Questionnaire, OFS: Occupational Functioning Scale The psychometrics include measures of internal consistency (α) and test-retest reliability (r_xx’).

^aRespondent of the instrument: P (Patient), C (Clinician), Any (for anyone) and Many (for multiple respondents).

^bFacets include E (employment), A (absenteeism) and P (presenteeism).

^cThe SAS-SR work subscale.

^d12 or 32 item versions for either clinician administered, self-report, or proxy respondents.

^eThe original Stanford Presenteeism Scale was developed in 2001 but several shorter versions came afterwards and are listed below.