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Journal of Patient-Reported Outcomes

Table 6 Item parameters of the non-PROMIS items after Stocking-Lord linking

From: Establishing a common metric for patient-reported outcomes in cancer patients: linking patient reported outcomes measurement information system (PROMIS), numerical rating scale, and patient-reported outcomes version of the common terminology criteria for adverse events (PRO-CTCAE)

NRS

a

b1

b2

b3

b4

b5

b6

b7

b8

b9

b10

SLa

A

SL

B

Anxiety

2.99

− 0.63

− 0.08

0.33

0.63

0.85

1.13

1.41

1.73

2.16

2.79

0.96

−0.00

Depression

3.75

−0.23

0.20

0.51

0.80

1.01

1.30

1.47

1.82

2.22

2.61

0.90

−0.20

Fatigue

3.34

−0.97

−0.41

− 0.06

0.28

0.50

0.85

1.13

1.59

2.18

2.59

0.84

0.26

Pain intensity

3.26

−0.94

−0.20

0.32

0.75

1.02

1.40

1.77

2.16

2.71

3.15

1.59

−0.26

Sleep disturbance

2.66

−1.65

−0.98

−0.32

0.16

0.49

0.92

1.25

1.72

2.31

2.70

1.00

−0.05

PRO-CTCAE

             

Anxiety severity

3.68

−0.38

0.65

1.59

2.47

      

0.96

−0.00

Anxiety frequency

3.95

−0.47

0.39

1.33

2.30

      

0.96

−0.00

Anxiety interference

3.43

0.34

1.09

1.83

2.56

      

0.96

−0.00

Depression: How often did you feel nothing could cheer you up?

4.07

0.06

0.81

1.58

2.22

      

0.90

−0.20

Depression: How often did you have sad/unhappy feelings?

3.96

− 0.74

0.33

1.26

2.28

      

0.90

−0.20

Depression: How much did feeling nothing could cheer you up interfere with activities?

4.11

0.34

1.08

1.73

2.39

      

0.90

−0.20

Depression: How much did sad/unhappy feelings interfere with activities?

3.90

0.15

0.94

1.62

2.32

      

0.90

−0.20

Depression: What was the severity of feelings that nothing could cheer you up at the worst?

4.61

0.20

0.89

1.71

2.40

      

0.90

−0.20

Depression: What was the severity of your sad/unhappy feelings at the worst?

3.80

−0.55

0.61

1.61

2.14

      

0.90

−0.20

Fatigue interference

4.95

−0.42

0.43

1.14

1.99

      

0.84

0.26

Fatigue severity

3.89

−0.85

0.25

1.24

2.06

      

0.84

0.26

Pain intensity

4.42

−1.02

0.36

1.43

2.47

      

1.58

−0.26

Pain interference

4.67

0.14

0.85

1.46

2.14

      

1.14

0.27

Sleep interference

2.90

−0.23

0.63

1.49

2.47

      

1.00

−0.05

Sleep severity

3.54

−0.58

0.25

1.28

2.23

      

1.00

−0.05

  1. aSL A: Stocking-Lord multiplicative constant, SL B: Stocking-Lord additive constant. Stocking-Lord’s A and B constants are computed from the two sets of parameters for the common items so that their test characteristic curves become as similar as possible
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