Table 3.

Average joint scores, item response theory joint parameter values, and Wald test results.

Joint	Average Joint Score^*		Discrimination Parameter		Difficulty Parameter		Results
Joint	Left	Right	Left	Right	Left	Right	Wald Test^**	p^†
Shoulder	0.24	0.22	0.721	0.686	1.252	1.350	0.139	0.93
Elbow	0.12	0.13	0.713	0.670	2.212	2.101	0.187	0.91
Wrist	0.35	0.38	0.983	1.094	0.747	0.613	0.295	0.86
MCP1	0.17	0.21	1.453	1.443	2.130	1.796	2.499	0.29
MCP2	0.21	0.25	1.627	1.735	1.867	1.617	1.756	0.42
MCP3	0.18	0.24	1.850	1.943	2.336	1.822	7.056	0.03
MCP4	0.12	0.14	2.269	1.953	3.406	2.804	4.415	0.11
MCP5	0.12	0.11	2.135	2.266	3.255	3.659	2.580	0.28
PIP1	0.13	0.14	1.552	1.369	2.613	2.334	0.974	0.61
PIP2	0.26	0.26	1.554	1.669	1.415	1.469	0.071	0.96
PIP3	0.26	0.33	1.898	1.784	1.650	0.986	4.617	0.10
PIP4	0.21	0.26	1.528	1.577	1.828	1.541	1.328	0.51
PIP5	0.18	0.19	1.579	1.708	2.131	2.196	0.072	0.96
Knee	0.20	0.20	0.778	0.710	1.572	1.516	0.017	0.99

↵* Average score on a scale from 0 to 1,
↵** with 2 degrees of freedom;
↵† p value for a simultaneous test for differences in difficulty and/or discrimination. MCP: metacarpophalangeal; PIP: proximal interphalangeal.