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Table 3 Uniform Differential Item Functioning (DIF) in the SF-12 items according to age, education level, sex and type of substance dependence

From: Differential item functioning (DIF) of SF-12 and Q-LES-Q-SF items among french substance users

 

Age

Education level

Sex

Type of substance dependence

 

MS total DIF

P

MS total DIF

P

MS total DIF

P

MS total DIF

P

SF-12 Physical Health domain

        

PH1. General health

0.749

0.357

0.180

0.649

0.034

0.845

2.359

0.099

PH2. Moderate activities

1.312

0.165

0.004

0.939

0.841

0.270

0.098

0.703

PH3. Climbing stairs

1.249

0.193

0.015

0.887

0.310

0.503

0.664

0.334

PH4. Accomplished less (physical)

0.221

0.596

1.812

0.126

0.777

0.320

0.294

0.540

PH5. Limited in work

0.007

0.910

0.130

0.623

0.502

0.317

0.171

0.566

PH6. Pain

0.532

0.407

0.006

0.928

0.052

0.796

1.299

0.196

SF-12 Mental Health domain

        

MH1: Accomplished less (emotional)

0.136

0.635

0.473

0.394

7.147

0.001a

0.050

0.784

MH2: Worked less carefully

2.867

0.042a

0.910

0.250

0.765

0.299

0.193

0.602

MH3: Felt calm

0.484

0.466

0.105

0.737

0.001

0.981

0.179

0.651

MH4: Felt downhearted

3.113

0.043a

0.006

0.923

0.066

0.766

2.534

0.064

MH5: Had energy

0.442

0.560

0.016

0.911

4.036

0.054

2.116

0.197

MH6: Social activities

3.002

0.079

0.053

0.813

0.354

0.539

0.007

0.933

  1. MS: mean square
  2. aUniform DIF: total DIF p < 0.05