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Table 2 Summary of the second item-selection phase using CTT and IRT

From: CHF-PROM: validation of a patient-reported outcome measure for patients with chronic heart failure

Item

SD

Factor analysis

Correlation coefficient

CICT

IRT

Outcome

a

b 1

b 2

b 3

b 4

PHD1

1.207

0.509

0.812

0.871

2.19

−0.60

0.27

0.60

2.00

√

PHD2

1.147

0.540

0.831

0.868

1.98

−1.05

−0.03

0.58

1.72

√

PHD3

1.051

0.618

0.755

0.876

1.98

−1.24

−0.13

0.56

1.90

√

PHD4

1.064

0.222

0.752

0.876

1.49

−1.62

− 0.41

0.26

1.96

√

PHD5

1.109

0.187

0.731

0.878

1.41

−2.00

−0.40

0.22

1.62

√

PHD6

0.997

0.763

0.680

0.882

1.66

−1.71

−0.87

− 0.15

0.97

√

PHD7

1.234

0.690

0.728

0.880

1.83

−0.89

−0.20

0.29

1.21

√

PHD8

0.978

0.385

0.659

0.883

2.10

−1.39

−0.58

−0.09

1.05

√

PHD9

0.770

0.195

0.558

0.889

1.71

−2.51

−1.41

−0.75

0.79

 

PHD10

0.745

0.263

0.543

0.889

1.55

−2.20

−1.72

−1.10

−0.09

 

PHD11

1.189

0.588

0.636

0.693

1.14

−1.85

−0.76

−0.13

1.29

√

PHD12

1.217

0.421

0.688

0.664

1.65

−1.23

0.19

0.71

1.84

√

PHD13

1.082

0.257

0.777

0.584

1.68

−1.55

−0.45

0.11

1.40

√

PHD14

0.839

0.055

0.657

0.645

1.05

−2.33

−1.16

0.17

1.87

 

PHD15

0.961

0.146

0.635

0.661

0.58

−6.29

−2.96

−2.28

0.77

√

PHD16

1.231

0.588

0.825

0.916

0.68

− 2.94

−1.05

0.16

2.55

√

PHD17

1.315

0.421

0.914

0.870

0.83

−1.75

−0.11

0.69

2.70

√

PHD18

1.387

0.257

0.936

0.857

0.89

−1.10

0.25

0.95

2.63

√

PHD19

1.403

0.055

0.881

0.894

0.76

−1.02

0.46

1.20

3.29

√

PSD1

1.101

0.588

0.701

0.874

2.21

−0.95

−0.06

0.38

1.74

√

PSD2

0.937

0.421

0.689

0.874

3.01

−1.00

−0.41

− 0.05

0.99

√

PSD3

1.183

0.257

0.716

0.873

2.38

−0.81

0.11

0.55

1.52

√

PSD4

1.074

0.055

0.810

0.860

2.59

−0.99

−0.07

0.32

1.48

√

PSD5

1.175

0.146

0.784

0.864

2.27

−0.98

0.24

0.67

1.69

√

PSD6

1.116

0.588

0.769

0.865

2.56

−0.89

−0.13

0.41

1.29

√

PSD7

1.205

0.421

0.719

0.873

2.64

−0.61

0.12

0.50

1.49

√

PSD8

1.208

0.257

0.760

0.867

2.55

−0.59

0.30

0.72

1.78

√

PSD9

0.998

0.709

0.778

0.886

2.95

−0.83

−0.38

−0.08

0.89

√

PSD10

1.050

0.703

0.834

0.875

3.25

−0.63

−0.22

0.20

1.28

√

PSD11

1.016

0.819

0.886

0.863

3.79

−0.65

−0.18

0.11

1.06

√

PSD12

0.973

0.712

0.804

0.880

3.20

−0.87

−0.27

0.03

1.08

√

PSD13

1.236

0.681

0.778

0.894

2.53

−0.58

0.01

0.39

1.27

√

PSD14

1.059

0.757

0.821

0.878

3.44

−0.63

−0.22

0.01

0.82

√

PSD15

1.002

0.541

0.887

0.829

3.18

−0.83

−0.27

0.09

1.03

√

PSD16

0.977

0.599

0.905

0.788

3.05

−0.80

−0.39

−0.06

0.92

√

PSD17

0.915

0.602

0.878

0.825

2.78

−0.98

−0.52

−0.26

0.71

√

PSD18

0.768

0.841

0.861

0.848

3.22

−1.31

−0.70

−0.28

0.53

√

PSD19

0.702

0.814

0.883

0.837

3.48

−1.43

−0.76

−0.37

0.51

√

PSD20

0.860

0.725

0.872

0.847

3.19

−1.00

−0.63

−0.24

0.51

√

PSD21

0.920

0.673

0.850

0.873

3.27

−0.91

−0.47

−0.11

0.63

√

SOD1

0.816

0.658

0.686

0.820

0.50

−5.37

−2.93

−1.73

1.74

√

SOD2

1.003

0.758

0.783

0.791

0.51

−7.36

−2.60

−1.20

2.94

√

SOD3

1.163

0.803

0.844

0.768

0.49

−6.00

−0.51

0.68

4.30

√

SOD4

1.346

0.694

0.777

0.820

0.46

−3.09

0.34

1.49

4.40

√

SOD5

1.074

0.739

0.798

0.787

0.48

−6.85

−1.80

−0.19

3.76

√

SOD6

1.226

0.578

0.746

0.859

0.40

−2.79

−0.31

0.52

3.10

√

SOD7

1.131

0.806

0.864

0.569

0.41

−4.39

1.03

2.87

7.13

√

SOD8

1.107

0.823

0.861

0.571

0.35

−2.05

0.68

1.61

2.83

√

TRE1

0.935

0.789

0.856

0.704

0.32

−2.88

−1.09

−0.08

1.00

√

TRE2

1.035

0.722

0.846

0.744

0.41

−4.90

−2.93

−1.72

2.43

√

TRE3

1.128

0.760

0.855

0.764

0.40

−6.56

−3.05

−1.48

2.66

√

TRE4

1.030

0.734

0.821

0.917

0.32

−10.72

−2.77

− 1.84

1.28

√

TRE5

1.021

0.799

0.868

0.911

0.39

−8.22

−2.96

−2.06

2.42

√

TRE6

1.000

0.847

0.890

0.908

0.42

−8.06

−3.88

−1.11

2.61

√

TRE7

0.999

0.847

0.858

0.912

0.41

−8.53

−2.85

−0.03

4.25

√

TRE8

1.042

0.810

0.770

0.924

0.41

−8.17

−2.54

0.12

4.49

√

TRE9

1.016

0.799

0.798

0.920

0.44

−8.33

−2.89

0.14

3.80

√

TRE10

1.055

0.824

0.831

0.916

0.40

−8.61

−3.80

−1.30

2.17

√

TRE11

1.242

0.817

0.432

0.793

0.40

−5.04

−1.05

0.77

2.95

√

TRE12

1.218

0.830

0.394

0.793

0.33

−1.66

0.05

1.53

2.65

√

  1. Note: The bold values do not meet the corresponding criteria of the methods of CTT and IRT