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Table 3 Inter-item correlation matrix based on polychoric correlations, pairwise deletion (n = 6622)

From: Is the Hospital Anxiety and Depression Scale (HADS) a valid measure in a general population 65–80 years old? A psychometric evaluation study

Items

1

2

3

4

5

6

7

8

9

10

11

12

13

14

1

1.000

             

2

0.398

1.000

            

3

0.586

0.374

1.000

           

4

0.469

0.575

0.501

1.000

          

5

0.640

0.405

0.752

0.542

1.000

         

6

0.489

0.514

0.495

0.659

0.576

1.000

        

7

0.588

0.445

0.511

0.557

0.561

0.568

1.000

       

8

0.572

0.474

0.542

0.544

0.582

0.616

0.536

1.000

      

9

0.628

0.377

0.699

0.495

0.676

0.470

0.529

0.552

1.000

     

10

0.290

0.404

0.300

0.396

0.304

0.473

0.344

0.436

0.270

1.000

    

11

0.641

0.351

0.518

0.443

0.551

0.482

0.581

0.527

0.559

0.330

1.000

   

12

0.462

0.640

0.460

0.672

0.507

0.680

0.523

0.587

0.446

0.504

0.442

1.000

  

13

0.617

0.368

0.684

0.484

0.674

0.510

0.556

0.572

0.719

0.358

0.594

0.458

1.000

 

14

0.293

0.356

0.284

0.437

0.288

0.477

0.446

0.367

0.254

0.351

0.356

0.446

0.346

1.000