Table 4 Item difficulty index and fit statistics.

From: Validation of the de Morton Mobility Index for measuring mobility related activities in Hungarian institutionalized older adults

VARIABLES

WEIGHTED FIT

Item

ESTIMATE

ERROR a

MNSQ b

CI

T c

1. Bridge

−4.904

0.304

1.59

(0.54, 1.46)

2.2

2. Roll onto side

−6.640

0.326

0.63

(0.45, 1.55)

−1.4

3. Lying to sitting

−5.124

0.248

1.14

(0.54, 1.46)

0.7

4. Sit unsupported

−5.547

0.313

1.21

(0.54, 1.46)

0.9

5. Sit to stand from chair

−2.674

0.203

0.98

(0.69, 1.31)

−0.1

6. Sit to stand without using arm

0.711

0.218

1.17

(0.71, 1.29)

1.1

7. Stand unsupported

−2.675

0.245

0.89

(0.64, 1.36)

−0.6

8. Stand feet together

1.330

0.222

1.19

(0.71, 1.29)

1.3

9. Stand on toes

8.599

0.320

1.67

(0.53, 1.47)

2.4

10. Tandem stand with eyes closed

9.997

0.363

1.85

(0.19, 1.81)

1.8

11. Walking distance

−2.414

0.187

1.05

(0.62, 1.38)

0.3

12. Walking independence

1.271

0.201

1.20

(0.74, 1.26)

1.4

13. Pick up pen from floor

0.668

0.220

1.07

(0.71, 1.29)

0.5

14. Walk 4 steps backwards

0.731

0.220

0.94

(0.71, 1.29)

−0.4

15. Jump

6.671*

0.981

1.57

(0.57, 1.43)

2.3

  1. An asterisk next to a parameter estimate indicates that it is constrained; Separation Reliability = 0.997; χ2 test for equality of parameters = 3462.212, df = 14, p = 0.000; aQuick standard errors have been used; bMNSQ: mean square fit values; cFit T statistics.
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