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Table 4 Work Productivity Survey baseline scores by defined known-groups: workplace productivity (randomized set, observed cases) a

From: 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

Instrumentb Number of days of work missed over the previous month, mean Number of days with productivity ≤50% at work over the previous month, mean Rate of arthritis interference with work productivity over previous month, meanc
  Worse Better Worse Better Worse Better
BASDAI
axSpA (cutoff 5.20 and 7.50) 3.27d 0.70 7.95d 2.86 5.44d 3.45
n = 59 n = 57 n = 59 n = 57 n = 59 n = 57
  AS (cutoff 5.20 and 7.30) 3.12d 0.56 8.12d 2.79 5.32e 3.71
n = 34 n = 34 n = 34 n = 34 n = 34 n = 34
  nr-axSpA (cutoff 5.40 and 7.60) 3.19f 0.79 9.63f 3.85 5.74d 3.26
n = 27 n = 28 n = 27 n = 28 n = 27 n = 28
BASFI
axSpA (cutoff 3.80 and 6.55) 4.02d 0.68 7.34f 4.22 5.79d 3.55
n = 56 n = 56 n = 56 n = 56 n = 56 n = 56
  AS (cutoff 4.30 and 6.80) 3.09e 0.87 5.47 2.73 5.31d 3.40
n = 32 n = 30 n = 32 n = 30 n = 32 n = 30
  nr-axSpA (cutoff 3.20 and 6.40) 6.04d 0.44 8.81 5.25 6.52# 3.63
n = 27 n = 25 n = 27 n = 25 n = 27 n = 25
Total Spine Pain
axSpA (cutoff 6 and 8) 2.97e 1.10 7.01d 2.99 5.57d 3.75
n = 88 n = 82 n = 88 n = 82 n = 88 n = 82
  AS (cutoff 6 and 8) 2.87d 0.52 6.40e 2.50 5.17e 3.90
n = 47 n = 42 n = 47 n = 42 n = 47 n = 42
  nr-axSpA (cutoff 6 and 8) 3.07 1.70 7.71e 3.51 6.02d 3.59
n = 41 n = 40 n = 41 n = 40 n = 41 n = 40
SF-36 PCS
axSpA (cutoff 37.54 and 27.49) 2.85e 0.76 6.13f* 2.98 5.85d 3.28
n = 54 n = 55 n = 54 n = 55 n = 54 n = 55
  AS (cutoff 37.44 and 27.93) 2.72e 0.62 6.48 2.86 5.62d 3.41
n = 29 n = 29 n = 29 n = 29 n = 29 n = 29
  nr-axSpA (cutoff 37.76 and 26.58) 3.84f 0.92 6.52 3.12 6.64d 3.12
n = 25 n = 26 n = 25 n = 26 n = 25 n = 26
SF-36 MCS
axSpA (cutoff 49.84 and 32.24) 4.78d 0.81 8.18e 3.54 5.58e 3.93
n = 55 n = 80 n = 55 n = 80 n = 55 n = 80
  AS (cutoff 52.73 and 32.87) 3.86e 0.89 7.00f 3.00 5.07 4.18
n = 29 n = 28 n = 29 n = 28 n = 29 n = 28
  nr-axSpA (cutoff 46.98 and 30.79) 5.65d 0.69 8.58e 3.23 6.08e 3.50
n = 26 n = 26 n = 26 n = 26 n = 26 n = 26
ASQoL
axSpA (cutoff 8.50 and 15.00) 4.40d 0.62 8.00d 3.35 6.26d 2.98
n = 58 n = 90 n = 58 n = 90 n = 58 n = 90
  AS (cutoff 8.00 and 14.91) 3.77d 0.42 7.53 3.61 5.73d 3.03
n = 30 n = 31 n = 30 n = 31 n = 30 n = 31
  nr-axSpA (cutoff 9.00 and 15.00) 5.07d 0.77 8.50e 3.33 6.82d 3.00
  n = 28 n = 30 n = 28 n = 30 n = 28 n = 30
  1. aASQoL: Ankylosing spondylitis quality of life; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; BASFI: Bath Ankylosing Spondylitis Functional Index; MCS: Mental Components Summary; PCS: Physical Components Summary; SF-36: Short form 36 items. bCutoff points represent the first and third quartiles of baseline scores: “Worse” state is defined for each individual measure as BASDAI score at or above the third quartile; BASFI score at or above the third quartile; Total Spine Pain score at or above the third quartile; ASQoL at or above the third quartile; SF-36 MCS at or below the first quartile; SF-36 PCS at or below the first quartile; “Better” state defined for each individual measure as BASDAI score at or below the first quartile; BASFI score at or below the first quartile; Total Spine Pain score at or below the first quartile; ASQoL score at or below the first quartile; SF-36 MCS, PCS at or above the third quartile; cWPS Q4 is scored on a 0 to 10 scale, where 0 = no interference and 10 = complete interference. dP ≤ 0.001; eP ≤ 0.01; fP ≤ 0.05; nonparametric bootstrap-t method with a variance stabilizing transformation, 10,000 replications.