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Table 4 Discriminative validity

From: Using the Fatigue Severity Scale to inform healthcare decision-making in multiple sclerosis: mapping to three quality-adjusted life-year measures (EQ-5D-3L, SF-6D, MSIS-8D)

 

Mean

SD

Obs

SES

EQ-5D vs FSS groups

 Mild/no fatigue

0.775

0.218

297

0.615

 Moderate fatigue

0.641

0.233

369

0.803

 Severe fatigue

0.454

0.3

357

 

 FFS total

0.614

0.285

1023

 

 F-statistic

131.84

Prob <

0.0001

 

 Bartlett’s chi2

40.065

Prob <

0.0001

 

SF-6D vs FSS groups

 Mild/no fatigue

0.747

0.124

189

0.871

 Moderate fatigue

0.639

0.099

225

0.879

 Severe fatigue

0.552

0.083

193

 

 FFS total

0.645

0.129

607

 

 F-statistic

172.46

Prob <

0.0001

 

 Bartlett’s chi2

30.047

Prob <

0.0001

 

MSIS-8D vs FSS groups

 Mild/no fatigue

0.764

0.115

202

0.739

 Moderate fatigue

0.679

0.134

240

1.381

 Severe fatigue

0.494

0.186

208

 

 FFS total

0.646

0.184

650

 

 F-statistic

180.71

Prob <

0.0001

 

 Bartlett chi2

51.434

Prob <

0.0001

 
  1. SD standard deviation, obs observations, SES standardised effect size, FSS Fatigue Severity Scale, EQ-5D EuroQoL EQ-5D-3L, SF-6D Short-Form 6D, MSIS-8D Multiple Sclerosis Impact Scale – Eight Dimensions