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Journal of Patient-Reported Outcomes

Table 3 Rasch analysis for the seven domains of the Norwegian PROMIS-29

From: The Norwegian PROMIS-29: psychometric validation in the general population for Norway

Domain/item (Overall fit p value, person separation index)a

Locationb

Fit residual

Chi-square

P value

Physical function (0.86, 0.92)

 Are you able to do chores such as vacuuming, housework, or light gardening

− 0.66

0.29

2.38

0.88

 Are you able to go up and down stairs normal pace

− 0.30

1.46

2.84

0.83

 Are you able to go for a walk of at least 15 min

0.35

− 2.46

6.33

0.39

 Are you able to run errands and shop

0.61

− 1.51

5.19

0.52

Anxiety (0.96, 0.91)

 I felt fearful

0.72

2.98

2.28

0.94

 I found it hard to focus on anything other than my anxiety

0.64

− 3.50

7.17

0.41

 My worries overwhelmed me

− 0.26

− 0.53

5.09

0.65

 I felt uneasy

− 1.10

− 3.84

1.54

0.98

Depression (0.97, 0.89)

 I felt worthless

− 0.06

0.63

1.92

0.93

 I felt helpless

− 0.16

1.92

2.25

0.90

 I felt depressed

− 0.17

1.18

1.27

0.97

 I felt hopeless

0.39

− 3.43

7.16

0.31

Fatigue (0.16, 0.93)

 I felt fatigued

− 0.43

− 2.76

1.45

0.98

 I have trouble starting things because I am tired

− 0.06

6.11

14.90

0.04

 How run-down did you feel on average

0.21

− 4.20

3.71

0.81

 How fatigued were you on average

0.28

− 10.71

15.48

0.03

Sleep disturbance (0.64, 0.85)

 My sleep quality was…

− 0.23

− 5.43

9.31

0.41

 My sleep was refreshing

− 0.75

8.52

8.57

0.48

 I had a problem with my sleep

0.48

− 8.07

10.38

0.32

 I had difficulty falling asleep

0.50

0.15

4.11

0.90

Ability to participate in social roles and activities (0.64, 0.85)

 I have trouble doing all of my regular leisure activities and exercise

0.03

0.35

2.52

0.96

 I have trouble doing all of my family activities that I want to do

0.39

− 1.71

4.15

0.84

 I have trouble doing all of my usual work (including working at home)

0.05

3.87

0.72

1.00

 I have trouble doing all of the activities with friends that I want to do

− 0.47

− 1.97

3.68

0.88

Pain interference (0.02, 0.95)

 How much did pain interfere with your day to day activities

− 0.70

− 0.13

10.55

0.16

 How much did pain interfere with work around the home

0.13

− 9.04

13.37

0.06

 How much did pain interfere with your ability to participate in social activities

0.34

2.52

11.57

0.12

 How much did pain interfere with your household chores

0.24

− 3.96

9.43

0.22

  1. aOverall fit p value for chi-square, where a non-significance (p > 0.05) indicates fit to the Rasch model. Person separation index is an estimate of reliability or the proportion of error free variance of the distribution of person estimates relative to the sum of this variance and the error variance in these estimates
  2. bLocation is the item position on the latent scale or level of health assessed. Fit residuals are the difference between the observed and expected scores for the item, a non-significant (p > 0.05) chi-square indicating fit to the Rasch model
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