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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