Measuring the ICF components of impairment, activity limitation and participation restriction: an item analysis using classical test theory and item response theory

Pollard, Beth; Dixon, Diane; Dieppe, Paul; Johnston, Marie

doi:10.1186/1477-7525-7-41

Table 2 A_ctt items ordered by difficulty

From: Measuring the ICF components of impairment, activity limitation and participation restriction: an item analysis using classical test theory and item response theory

Item	Origin	Mean	s.d.
A1. What degree of difficulty do you have climbing up and down several flights of stairs?	^	4.22	0.84
*A2. Does your health now limit you in these activities? Walking 100 yards**	SF-36	4.09	0.85
A3. What degree of difficulty do you have walking long distances on the flat (greater than 1/2 mile)?	SF-36	4.06	0.89
A4. What degree of difficulty do you have bending to floor?	WOMAC	3.63	1.02
A5. What degree of difficulty do you have climbing up and down one flight of stairs?	^	3.57	0.97
A6. What degree of difficulty do you have putting on socks/stockings?	WOMAC	3.47	1.14
A7. What degree of difficulty do you have ascending stairs?	WOMAC	3.36	0.91
A8. What degree of difficulty do you have rising from sitting?	WOMAC	3.32	0.84
A9. What degree of difficulty do you have descending stairs?	WOMAC	3.31	0.95
A10. What degree of difficulty do you have lifting?	AIMS	3.28	1.04
A11. What degree of difficulty do you have standing?	WOMAC	3.27	0.93
A12. What degree of difficulty do you have walking on the flat?	WOMAC	3.26	0.82
A13. What degree of difficulty do you have taking off socks/stockings?	WOMAC	3.24	1.13
A14. Do you use a walking stick?	FLP	3.21	1.69
A15. What degree of difficulty do you have rising from bed?	WOMAC	3.04	0.96
A16. What degree of difficulty do you have putting on/off shoes?	WOMAC	2.87	1.20
*A17. Does your health now limit you in these activities? Bending, kneeling or stooping**	SF-36	2.85	1.25
A18. What degree of difficulty do you have getting on/off toilet?	WOMAC	2.72	0.99
A19. What degree of difficulty do you have lying in bed?	WOMAC	2.65	1.03
A20. What degree of difficulty do you have sitting?	WOMAC	2.56	0.93
A21. What degree of difficulty do you have dressing yourself (except shoes and socks)?	HAQ	2.15	0.98
A22. What degree of difficulty do you have washing and drying yourself?	SIP	2.13	1.01
A23. What degree of difficulty do you have washing your hair?	HAQ	1.91	1.06
A24. Do you need someone to help you go upstairs?	SIP	1.80	1.15
A25. Do you need someone to help you when you are walking?	SIP	1.78	1.01
A26. Do you need someone to help you go downstairs?	SIP	1.78	1.17

Items in bold removed by CTT/IRT item analysis
* These items had three categories and were rescaled to a five point scale.
^ Stair items: There was almost every combination of stair use represented in the original item pool. For parsimony not all combinations could be added at this stage, these two were added to complement and constrast with the stair items already in.

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