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Table 3 Reliability parameters of the WHOQOL-OLD facets

From: The psychometric properties of the German version of the WHOQOL-OLD in the German population aged 60 and older

 

Classical test theory

IRT

Item no./WHOQOL-OLD facet

Item-test correlation

Corrected item-test correlation

Inter-item correlation

Cronbach's alpha if item deleted/alpha

Q-Index

INFIT

Old 01

0.8882

0.7849

0.6350

0.8369

−0.1828

0.687

Old 02

0.9137

0.8337

0.6035

0.8167

−0.5315

0.509

Old 10

0.8206

0.6755

0.7097

0.8793

0.6041

1.031

Old 20

0.8255

0.7114

0.6842

0.8669

0.1172

0.780

Sensory abilities

 

0.6581

0.8842

Andrich reliability

0.798

Old 03

0.7790

0.6062

0.4057

0.6696

−0.5757

0.662

Old 04

0.7595

0.5148

0.4694

0.7218

0.5710

0.847

Old 05

0.7472

0.5558

0.4371

0.6949

−0.0180

0.747

Old 11

0.7594

0.5409

0.4519

0.7017

0.1018

0.797

Autonomy

 

0.4015

0.7537

Andrich reliability

0.703

Old 12

0.8197

0.6062

0.4228

0.6851

−0.1279

0.694

Old 13

0.7849

0.5811

0.4377

0.6945

−0.0293

0.737

Old 15

0.7141

0.5254

0.4750

0.7263

0.2049

0.804

Old 19

0.7402

0.5551

0.4608

0.7112

−0.0690

0.771

Past, present and future activities

  

0.4491

0.7619

Andrich reliability

0.751

Old 14

0.7514

0.5667

0.6817

0.8596

1.3272

1.071

Old 16

0.8309

0.7167

0.5781

0.8042

−0.4557

0.694

Old 17

0.8897

0.7891

0.5318

0.7656

−0.9818

0.540

Old 18

0.8600

0.7146

0.5804

0.8019

0.0255

0.718

Social participation

  

0.5930

0.8502

Andrich reliability

0.801

Old 06

0.8443

0.7211

0.5859

0.8095

−0.5266

0.737

Old 07

0.8806

0.7666

0.5559

0.7884

−1.2724

0.610

Old 08

0.8163

0.6747

0.6163

0.8280

0.4899

0.849

Old 09

0.8044

0.6432

0.6403

0.8415

1.1852

0.946

Death and dying

  

0.5996

0.8567

Andrich reliability

0.829

Old 21

0.8675

0.7667

0.7625

0.9051

0.5563

0.901

Old 22

0.9230

0.8517

0.7022

0.8767

−0.5745

0.578

Old 23

0.8958

0.8153

0.7278

0.8891

−0.1093

0.706

Old 24

0.8897

0.8018

0.7369

0.8934

0.1258

0.765

Intimacy

  

0.7324

0.9162

Andrich reliability

0.888