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Table 2 Known- groups (construct) validity effect sizes for the pain troublesomeness (baseline data)

From: An empirical evaluation of the SF-12, SF-6D, EQ-5D and Michigan Hand Outcome Questionnaire in patients with rheumatoid arthritis of the hand

Instruments Pain Troublesomeness
  Low
(n = 126)
High
(n = 362)
Effect size
(95% CI)
  Mean HRQoL score (SD)  
MHQ 66.23(13.76)a 45.34 (13.95) 1.51 (1.28,1.73)
EQ-5D (utility) 0.73 (0.20)a 0.53 (0.28) 0.77 (0.57, 0.98)
EQ-5D (VAS) 77.10(15.67)a 63.09(18.41) 0.79 (0.58,0.99)
SF-12 (PCS) 40.70(9.67)a 31.81(8.57) 0.81 (0.60, 1.02
SF-12 (MCS) 51.99(9.10)a 47.33(11.35) 0.33 (0.13, 0.54)
SF-6D 0.71(0.13)a 0.61(0.13) 0.78 (0.57, 0.99)
  1. Statistically significant differences betweena Low/ High score of pain troublesomeness (2 sample t-test). Effect size is calculated as the difference in means scores divided by the pool standard deviations. Effect size values for the dichotomous variables are considered small (<0.5), medium (0.5-0.8), or large (>0.8). Values in bold indicate large effect sizes