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. 2014 Aug 6;16(4):R164. doi: 10.1186/ar4680

Table 4.

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

Instrument b 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, mean c
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

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. d P ≤ 0.001; e P ≤ 0.01; f P ≤ 0.05; nonparametric bootstrap-t method with a variance stabilizing transformation, 10,000 replications.