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Table 3 Summary of fit statistics for the Swedish version of the Self-Efficacy to Manage Chronic Disease (SEMCD) scale showing full scale and modified versions. The SEMCD item 1-4 where response option 4-5-6 is collapsed for item 1 is further reported in the section on SEMCD-4.

From: Self-Efficacy to Manage Chronic Disease (SEMCD) scale: translation and evaluation of measurement properties for a swedish version

 

Differential item functioning (DIF)

 

Item number

Item

Location

2SE

FitResid

Prob

Disordered thresholds

Cohort

Gender

Age Group

Education

SEMCD—full scale

1

Confidence in keeping fatigue from interfering

0.36

0.07

-0.91

0.02

x

x

 

x

 

2

Confidence in keeping pain/physical discomfort from interfering

-0.06

0.06

-0.35

0.01

     

3

Confidence in keeping emotional distress from interfering

0.30

0.07

-1.31

0.06

x

x

x

x

 

4

Confidence in keeping other symptoms from interfering

0.02

0.07

-2.16

0.01

     

5

Confidence in reduce need to the doctor

-0.13

0.07

-0.63

0.45

     

6

Confidence in reduce the illness effects

-0.49

0.06

5.80

0.00

 

x

x

x

x

SEMCD

item 1–5

1

Confidence in keeping fatigue from interfering

0.30

0.08

-0.69

0.11

x

 

x

  

2

Confidence in keeping pain/physical discomfort from interfering

-0.18

0.07

0.22

0.09

     

3

Confidence in keeping emotional distress from interfering

0.26

0.08

-1.31

0.23

 

x

   

4

Confidence in keeping other symptoms from interfering

-0.10

0.07

-1.22

0.10

     

5

Confidence in reduce need to the doctor

-0.28

0.07

3.06

0.32

     

SEMCD item 1–4

1

Confidence in keeping fatigue from interfering

0.25

0.08

-0.31

0.13

x

    

2

Confidence in keeping pain/physical discomfort from interfering

-0.28

0.08

-0.10

0.10

     

3

Confidence in keeping emotional distress from interfering

0.22

0.08

-0.72

0.22

 

x

x

  

4

Confidence in keeping other symptoms from interfering

-0.19

0.08

0.99

0.49

     

SEMCD item 1–4,

response options

4–5-6 collapsed

for item 1

1

Confidence in keeping fatigue from interfering

0.47

0.10

0.44

0.03

   

x

 

2

Confidence in keeping pain/physical discomfort from interfering

-0.36

0.08

-0.10

0.07

     

3

Confidence in keeping emotional distress from interfering

0.16

0.08

-0.48

0.56

 

x

x

  

4

Confidence in keeping other symptoms from interfering

-0.27

0.08

1.23

0.16