Investigating psychometric properties of the arm activity measure – Thai version (ArmA-TH) sub‐scales using the Rasch model

Table 2 Rasch analysis results of ArmA-TH passive and active function sub-scale

Section A^a Passive function sub-scale	Measure	Infit	Outfit	Disordered threshold	Local dependence
1. Cleaning palm	0.08	0.93	0.89	Yes	No
2. Cutting fingernails	-0.79	0.79	0.77	Yes	No
3. Putting on a glove	-0.49	0.96	0.86	Yes	No
4. Cleaning armpit	-0.03	0.8	0.73	No	No
5. Putting arm through a sleeve	0.07	1.21	1.23	No	No
6. Put on a splint	1.06	1.31	0.89	Yes	No
7. Positioning arm on a cushion or support in sitting	0.09	1.19	1.31	Yes	No
Section B^b Active function sub-scale
1. Fasten buttons on clothing	-0.39	0.96	0.87	Yes	No
2. Pick up a glass, bottle, or can	1.15	0.86	1.11	Yes	No
3. Use a key to unlock the door	-0.06	0.91	0.8	Yes	No
4. Write on paper	-0.54	1.22	1.22	Yes	No
5. Open a previously opened jar	-0.39	0.92	0.92	Yes	No
6. Eat with a knife and fork	0.55	0.94	0.8	Yes	No
7. Hold an object still while using unaffected hand	-1.66	1.38	1.75	Yes	No
8. Difficulty with balance when walking due to your arm	-0.87	1.12	1.27	Yes	No
9. Dial a number on home phone	-0.2	1.07	0.88	Yes	No
10. Tuck in your shirt	-0.36	1.19	1.3	Yes	No
11. Comb or brush your hair	0.92	0.64	0.35	Yes	#12 #13
12. Brush your teeth	0.89	0.68	0.57	Yes	#13
13. Drink from a cup or mug	0.95	0.72	0.41	Yes	#12

^aAsks about ‘caring’ for your affected arm either yourself with your unaffected arm or by a carer or a combination of both of these. This section does not ask about using your affected arm to complete any of the tasks. ^bAsks what you can do with your affected arm or using both arms

ISSN: 1471-2288