Table 1.

Gender- and Education-Based Statistically Significant DIF

Item	MIMIC p- values	LORDIF p- values	R2	Magnitude
Gender-Based Non-Uniform DIF
Historical Disability Speech	<0.0005	0.0001	0.0019	Negligible
Objective Disability Communication	<0.0005	<0.00005	0.0025	Negligible
Gender-Based Uniform DIF
Historical Disability Time Spent with On-Dyskinesia	<0.0005	0.0005	0.0015	Negligible
Education-Based Non-Uniform DIF
None	NA	NA	NA	NA
Education-Based Uniform DIF
Historical Disability Time Spent with On-Dyskinesia
<7 vs. all others	<0.0005	<0.00005	0.003	Negligible
Historical Disability Chewing/Swallowing
>12 vs. all others	<0.0005	<0.00005	0.0035	Negligible
Historical Disability Eating tasks
>12 vs. all others	<0.0005	0.00001	0.0021	Negligible
Historical Disability Dressing
>12 vs. all others	<0.0005	<0.00005	0.0031	Negligible
Historical Disability Hygiene
<7 vs. all others	<0.0005	<0.00005	0.0057	Negligible
>12 vs. all others	<0.0005	<0.00005	0.0079	Negligible

Legend: Most of the UDysRS items did not meet the minimal statistical criteria for DIF (see text). The Table lists items with DIF identified by both lordif and MIMIC as independent approaches (p values shown) with McFadden’s R² (R²) indicating the impact of the DIF.