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. 2014 Jul 4;16(4):R140. doi: 10.1186/ar4602

Table 4.

Kendall association coefficients between WPS and clinical and HRQoL assessments at baseline (randomized set, observed cases)

 
 WPS question
  2: number of work days missed because of arthritis 3: number of days with work productivity reduced by one-half or more because of arthritis 4: rate of arthritis interference with work productivity on a scale of 0 to 10 5: number of days with no household work because of arthritis 6: number of days with household work productivity reduced by one-half or more because of arthritis 7: number of days missed of family, social, or leisure activities because of arthritis 8: number of days with outside help hired because of arthritis 9: rate of arthritis interference with household work productivity on a scale of 0 to 10
DAS28 (CRP)
 0.16**
 0.09
 0.16**
 0.22**
 0.13**
 0.15**
 0.12*
 0.24**
PASIa
 0.11
 0.06
 −0.02
 −0.01
 0.05
 0
 0.02
 −0.04
HAQ-DI
 0.25**
 0.21**
 0.32**
 0.34**
 0.26**
 0.28**
 0.22**
 0.38**
SF-36 MCS
 −0.16**
 −0.16**
 −0.22**
 −0.23**
 −0.24**
 −0.34**
 −0.24**
 −0.28**
SF-36 PCS
 −0.19**
 −0.15**
 −0.28**
 −0.31**
 −0.20**
 −0.19**
 −0.15**
 −0.32**
SF-36 PF
 −0.22**
 −0.16**
 −0.27**
 −0.36**
 −0.22**
 −0.25**
 −0.20**
 −0.34**
SF-36 BP
 −0.29**
 −0.20**
 −0.33**
 −0.34**
 −0.24**
 −0.33**
 −0.19**
 −0.38**
SF-36 RE
 −0.24**
 −0.21**
 −0.28**
 −0.29**
 −0.23**
 −0.35**
 −0.30**
 −0.31**
SF-36 RP
 −0.26**
 −0.24**
 −0.34**
 −0.32**
 −0.26**
 −0.28**
 −0.23**
 −0.37**
SF-36 GH
 −0.07
 −0.09
 −0.18**
 −0.16**
 −0.15**
 −0.15**
 −0.17**
 −0.20**
SF-36 MH
 −0.15*
 −0.15*
 −0.20**
 −0.19**
 −0.23**
 −0.29**
 −0.21**
 −0.27**
SF-36 SF
 −0.17**
 −0.21**
 −0.26**
 −0.30**
 −0.26**
 −0.36**
 −0.17**
 −0.30**
SF-36 VT
 −0.14*
 −0.10*
 −0.18**
 −0.27**
 −0.22**
 −0.27**
 −0.17**
 −0.30**
PsAQoL
 0.24**
 0.23**
 0.30**
 0.28**
 0.28**
 0.37**
 0.27**
 0.35**
DLQI
 0.11#
 0.03
 0.06
 0.08#
 0.09*
 0.15**
 0.08#
 0.10*
EQ-5D VAS −0.09 −0.09 −0.19** −0.15** −0.13** −0.14** −0.12** −0.20**

aAssessed only in patients with at least 3% body surface area at baseline. **P ≤ 0.001. *P ≤ 0.01. #P ≤ 0.05.

WPS Questions 2 to 4 were assessed in employed patients only, whereas Questions 5 to 9 were assessed in all patients; Questions 4 and 9 are 0 to 10 scales, where 0 = no interference and 10 = complete interference. Correlation level (absolute value): low correlations, 0 to 0.1 (plain text), 0.1 (inclusive) to 0.3 (italic); moderate correlation, ≥0.3 to <0.5 (bold). HAQ-DI, lower score = better; DAS28, lower score = better; PASI, lower score = better; PsAQoL, lower score = better; DLQI, lower score = better; SF-36, higher score = better; EQ-5D VAS, higher score = better. BP, bodily pain; DAS28(CRP), Disease Activity Score – 28-joint count based on C-reactive protein; DLQI, Dermatology Life Quality Index; DMARD, disease-modifying antirheumatic drug; EQ-5D, EuroQoL-5 dimensions; GH, general health; HAQ-DI, Health Assessment Questionnaire – Disability Index; HRQoL, health-related quality of life; MCS, mental component summary; MH, mental health; PASI, Psoriasis Area and Severity Index; PCS, physical component summary; PsAQoL, Psoriatic Arthritis Quality of Life; PF, physical functioning; RE, role emotional; RP, role physical; SF, social functioning; SF-36, Short Form-36 items; VAS, visual analogue scale; VT, vitality; WPS, Work Productivity Survey.