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Table 5 13-item SFInX: item fit and difficulty (ordered by misfit (INFIT MNSQ) of items to the Rasch model)

From: The Shoulder Function Index (SFInX): a clinician-observed outcome measure for people with a proximal humeral fracture

Item

PCM

No.

Name

Difficulty

INFIT

OUTFIT

  

Logits (SE)

MNSQ

ZSTD

MNSQ

ZSTD

6

wash lower back

2.85 (0.23)

1.53

2.6

1.41

1.0

7

lying on affected side

−1.61 (0.27)

1.43

2.1

1.28

0.7

3

wash back shoulder

3.20 (0.24)

1.30

1.6

1.17

0.5

10

carry heavy object

−0.47 (0.22)

1.28

1.2

1.49

0.8

2

wash armpit

−1.53 (0.38)

1.27

1.2

1.58

0.9

8

reach behind for object

−0.12 (0.32)

1.15

0.9

0.83

−0.2

9

hold object arm by side

−1.53 (0.38)

0.84

−0.7

0.44

−0.7

12

hang up washing

2.34 (0.21)

0.82

−0.9

0.58

−0.7

4

comb hair

0.83 (0.22)

0.79

−1.4

0.72

−1.2

5

tuck in shirt

−1.29 (0.27)

0.78

−1.4

0.65

−1.5

13

throw ball overhead

1.66 (0.21)

0.66

−2.1

0.46

−1.4

11

lift object shoulder level

−1.00 (0.35)

0.64

−2.0

0.35

−0.9

1

drink from cup

−3.34 (0.56)

0.60

−1.1

0.14

−1.0

 

Test mean

0.00 (0.30)

1.01

0.0

0.85

−0.3

 

Test SD

1.93 (0.10)

0.31

1.6

0.46

0.9