Discriminant validity, responsiveness and reliability of the arthritis-specific Work Productivity Survey assessing workplace and household productivity in patients with psoriatic arthritis

Table 3 Workplace and household productivity at baseline (randomized set, observed cases)

	All randomized patients (n = 409)
WPS question^a	n	Mean (SD)	Median
2. Number of days of work missed (absenteeism)^b	243	2.0 (5.33)	0.0
3. Number of days with productivity ≤50% at work (presenteeism)^b,c	243	4.7 (7.41)	0.0
4. Rate of arthritis interference with work productivity^b,d	242	4.1 (2.83)	5.0
5. Number of days of household work missed	406	5.7 (8.41)	2.0
6. Number of days with productivity ≤50% in household work^c	406	7.6 (8.67)	5.0
7. Number of days of family, social or leisure activities missed	406	3.7 (7.25)	0.0
8. Number of days with outside help	409	2.4 (6.43)	0.0
9. Rate of arthritis interference with household work productivity^d	409	5.0 (2.95)	5.0

SD, standard deviation. ^aRecall period for Work Productivity Survey (WPS) is 1 month. ^bAssessed in employed patients only. ^cDays counted exclude those counted in previous question. ^dScored using numeric rating scale of 0 to 10, where 0 = no interference and 10 = complete interference.

ISSN: 1478-6362