Table 2.

BSRBR-AS study: changes in work outcomes between biological and non-biological cohort

WPAI measures (in the last 7 days)	Biological cohort	Non-biological cohort	Mean difference in change*	95% CI
Absenteeism, %	−1.0	0.5	−1.5	−8.0 to 4.9
Presenteeism, %	−11.9	−2.5	−9.4	−15.3 to − 3.5
Overall work impairment, %	−11.9	2.0	−13.9	−21.1 to − 6.7
Overall activity impairment, %	−17.6	1.6	−19.2	−26.3 to − 12.2

+, deterioration; −, improvement.

*Difference=biological – non-biological cohort (adjusted for differences using propensity score matching).

WPAI, Work Productivity and Activity Impairment.