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Table 3 Item locations as estimated by the 2PL GRM

From: An item response theory evaluation of three depression assessment instruments in a clinical sample

Item

Item location

Corrected location to person mean = 0

S.E.

AS-18-D1

0.902

0.766

0.354

AS-18-D2

0.096

−0.039

0.164

AS-18-D3

0.677

0.541

0.324

AS-18-D4

0.479

0.344

0.182

AS-18-D5

0.299

0.164

0.221

AS-18-D6

−0.134

−0.270

0.303

AS-18-D7

0.241

0.106

0.187

AS-18-D8

0.635

0.499

0.276

AS-18-D9

1.542

1.406

0.239

PHQ9:1

0.055

−0.013

0.189

PHQ9:2

−0.094

−0.162

0.168

PHQ9:3

−0.266

−0.334

0.244

PHQ9:4

−0.114

−0.182

0.221

PHQ9:5

0.551

0.483

0.284

PHQ9:6

0.067

−0.001

0.174

PHQ9:7

−0.393

−0.461

0.225

PHQ9:8

0.728

0.660

0.273

PHQ9:9

1.417

1.349

0.263

MADRS1

0.160

0.133

0.198

MADRS2

0.588

0.561

0.222

MADRS3

−0.252

−0.279

0.284

MADRS4

1.832

1.805

1.372

MADRS5

1.161

1.134

0.361

MADRS6

−0.582

−0.609

0.314

MADRS7

0.641

0.614

0.439

MADRS8

0.052

0.025

0.409

MADRS9

−0.178

−0.205

0.247

MADRS10

1.197

1.170

0.309