Discriminant validity, responsiveness and reliability of the arthritis-specific Work Productivity Survey assessing workplace and household productivity within and outside the home in patients with axial spondyloarthritis, including nonradiographic axial spondyloarthritis and ankylosing spondylitis

Table 3 Workplace and household productivity at baseline in axial spondyloarthritis, ankylosing spondylitis and nonradiographic axial spondyloarthritis populations (randomized sets, observed cases)^a

	axSpA (n = 324)			AS (n = 178)			nr-axSpA (n = 146)
WPS questions^b	n	Mean (SD)	Median	n	Mean (SD)	Median	n	Mean (SD)	Median
Q2. Number of days of work missed (absenteeism)^c	223	2.0 (4.8)	0.0	119	1.6 (3.5)	0.0	104	2.5 (6.0)	0.0
Q3. Number of days with productivity ≤50% at work (presenteeism)^c,d	222	5.2 (7.6)	0.0	119	4.7 (7.1)	0.0	103	5.8 (8.0)	2.0
Q4. Rate of arthritis interference with work productivity^c,e	222	4.6 (2.6)	5.0	119	4.5 (2.4)	5.0	103	4.8 (2.9)	5.0
Q5. Number of days of household work missed	324	5.8 (8.3)	2.0	178	5.2 (7.7)	1.0	146	6.5 (8.8)	3.0
Q6. Number of days with productivity ≤50% in household work^d	324	7.5 (8.9)	5.0	178	7.0 (8.6)	4.0	146	8.1 (9.2)	5.0
Q7. Number of days of family, social or leisure activities missed	324	4.4 (6.9)	1.0	178	3.6 (6.1)	0.5	146	5.4 (7.8)	2.0
Q8. Number of days with outside help	324	2.1 (5.8)	0.0	178	1.6 (4.8)	0.0	146	2.7 (6.8)	0.0
Q9. Rate of arthritis interference with household work productivity^e	324	4.9 (2.9)	5.0	178	4.9 (2.7)	5.0	146	4.8 (3.2)	5.0

^aAS, Ankylosing spondylitis; axSpA, Axial spondyloarthritis, nr-axSpA, Nonradiographic axial spondyloarthritis. ^bRecall period for Work Productivity Survey is 1 month. ^cAssessed in employed patients only. ^dDays counted exclude those counted in previous question (full days missed). ^eScored from 0 to 10, where 0 = no interference and 10 = complete interference.

ISSN: 1478-6362