Rasch analysis of the Patient Rated Elbow Evaluation questionnaire

Table 2 Initial fit statistics for individual items of the PREE

Item	Location	SE	Fit statistics
Item	Location	SE	Fit residual	Chi Square	Chi square probability
Pain sub scale
Pain - When it is at its worst	−0.32	0.05	0.88	1.62	0.66
Pain - At rest	1.32	0.04	−1.10	2.05	0.56
Pain - When lifting a heavy object	−0.67	0.06	1.05	3.85	0.28
Pain - When doing a task with repeated elbow movement	−0.36	0.05	−1.28	4.35	0.23
How often do you have pain?	0.03	0.06	0.06	1.87	0.60
Specific activities sub scale
Comb my hair	0.50	0.08	−1.42	7.70	0.05
Eat with a fork or spoon	0.55	0.08	−1.26	4.15	0.25
Pull a heavy object	−1.25	0.09	−0.91	1.07	0.78
Use my arm to rise from a chair	−0.35	0.07	−0.12	3.08	0.38
Carry a 10 lb object with my arm at my side	−0.82	0.07	2.29	13.61	0.03
Throw a small object, such as a tennis ball	−0.60	0.08	0.96	0.24	0.97
Use a telephone	0.63	0.07	1.03	5.69	0.13
Do up buttons on the front of my shirt	0.42	0.07	0.91	2.64	0.45
Wash my opposite armpit	0.44	0.08	−1.04	6.41	0.09
Tie my shoe	0.37	0.10	1.27	6.19	0.10
Turn the doorknob and open a door	0.10	0.08	0.56	1.43	0.70
Usual activities sub scale
Personal activities (dressing, washing)	0.86	0.06	−0.97	1.91	0.39
Household work (cleaning, maintenance)	−0.04	0.05	−2.17	3.95	0.14
Work (your job or everyday work)	−0.35	0.07	0.25	2.01	0.37
Recreational activities	−0.47	0.07	0.65	0.12	0.94

SE-standard error; PREE – Patient Rated elbow Evaluation; ^a Was not significant after Bonferroni correction applied

ISSN: 1477-7525