Table 5 Estimated IRT parameter values for the 9Q score with the GRM for the developmental group

Mood

4.043

1.111

1.510

1.926

1.998

2.263

2.534

All

3.834

1.189

1.581

1.986

2.056

2.311

2.570

Interest

3.182

0.766

1.464

2.059

2.183

2.504

2.758

M

2.160

1.055

1.796

2.705

2.806

2.920

3.467

F

2.160

0.869

1.698

2.302

2.456

2.917

3.114

Sleep

1.284

1.137

1.894

2.475

2.655

2.997

3.525

All

1.361

1.173

1.894

2.446

2.618

2.943

3.443

Fatigue

3.004

1.303

1.774

2.303

2.436

2.670

2.990

All

3.072

1.360

1.820

2.333

2.578

2.929

3.115

Weight

1.425

1.461

2.013

2.702

2.972

3.351

3.776

M

2.160

1.259

1.675

1.932

2.113

2.442

2.805

F

2.160

1.289

1.706

2.391

2.612

2.827

3.075

Guilty

2.191

1.399

1.876

2.320

2.513

2.820

3.187

All

2.265

1.446

1.909

2.341

2.527

2.823

3.176

Concentration

2.176

1.028

1.835

2.462

2.556

3.004

3.406

All

2.304

1.077

1.853

2.453

2.542

2.967

3.350

Psychomotor

2.063

1.202

1.830

2.443

2.535

2.912

3.376

All

2.194

1.242

1.843

2.427

2.513

2.871

3.311

Suicide

2.997

1.979

2.296

2.605

2.819

3.001

3.290

All

3.176

1.998

2.305

2.603

2.809

3.051

3.285