Table 2

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

WPAI measures (in the last 7 days)Biological cohortNon-biological cohortMean difference in change*95% CI
Absenteeism, %−1.00.5−1.5−8.0 to 4.9
Presenteeism, %−11.9−2.5−9.4−15.3 to − 3.5
Overall work impairment, %−11.92.0−13.9−21.1 to − 6.7
Overall activity impairment, %−17.61.6−19.2−26.3 to − 12.2
  • +, deterioration; , improvement.

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

  • WPAI, Work Productivity and Activity Impairment.