Skip to main content

Table 3 Item summary of Rasch calibration in FFI-RS

From: Many-faceted rasch calibration of the foot function index-revised short form

Item

Subscale

Calibration logits

SE logits

Infit MNSQ

Outfit MNSQ

Q25

Walking with assistive devices?

Difficulty

1.48

.05

1.09

1.05

Q21

Getting out of a chair?

Difficulty

1.29

.03

.95

.89

Q33

Burden of taking medication to control foot pain?

Social Issues

.87

.04

1.34

1.38

Q24

Keeping your balance?

Difficulty

.81

.03

1.19

1.20

Q01

Before you get up in the morning?

Pain

.79

.03

1.23

1.36

Q20

When you carried or lifted objects weighing more than five pounds?

Difficulty

.69

.03

1.08

1.00

Q27

Limit your outdoor activities because of foot problems?

Activity Limitation

.40

.03

1.11

1.16

Q05

When you stood wearing custom shoe inserts?

Pain

.27

.05

.88

.88

Q13

When you walked wearing custom shoe inserts?

Stiffness

.23

.05

.90

.93

Q11

When you stood wearing shoes?

Stiffness

.11

.03

.79

.77

Q03

When you stood wearing shoes?

Pain

.10

.03

.82

.89

Q06

When you walked wearing custom shoe inserts?

Pain

.09

.05

.94

.93

Q08

Before you get up in the morning?

Stiffness

.09

.03

1.09

1.09

Q02

When you first stood without shoes?

Pain

.05

.03

.91

.92

Q32

Difficulty participating in social activities due to footwear?

Social Issues

.04

.03

1.34

1.32

Q09

When you stood without shoes?

Stiffness

-.01

.03

.96

.95

Q18

Descending stairs?

Difficulty

-.07

.03

.75

.71

Q12

When you walked wearing shoes?

Stiffness

-.08

.03

.87

.85

Q17

Climbing stairs?

Difficulty

-.14

.03

.74

.70

Q10

When you walked without shoes?

Stiffness

-.15

.03

.92

.90

Q14

Before you went to sleep at night?

Stiffness

-.19

.03

1.09

1.05

Q31

Limit social activities due to foot problems?

Social Issues

-.24

.03

1.06

1.08

Q34

Concern about limited work around the house?

Social Issues

-.27

.03

.98

.95

Q15

Walking outside on uneven ground?

Difficulty

-.36

.03

.78

.73

Q04

When you walked wearing shoes?

Pain

-.40

.03

.89

.91

Q28

Limit your leisure/sport activities because of foot problems?

Activity Limitation

-.40

.03

1.25

1.28

Q30

Feeling awful because of foot problem?

Social Issues

-.40

.03

1.13

1.39

Q22

Walking fast?

Difficulty

-.58

.03

.86

.78

Q16

Walking four or more blocks?

Difficulty

-.58

.03

.90

.80

Q19

Standing on tip toes?

Difficulty

-.69

.03

1.22

1.09

Q07

At the end of a typical day?

Pain

-.92

.03

1.02

1.09

Q23

Running?

Difficulty

-1.84

.04

1.22

.94

  1. MNSQ mean square residuals