Table 3. Breadth of Coverage for simulated 5- and 10-item Physical Function CATs and Full Item Bank based on Claimant Data Presented by Content Subdomain.

Subdomain	Mode	N	Mean (SD), Range	%Ceiling	%Floor
Changing and Maintaining	5-item CAT	1017	50.08(10.43),(16.45,85.55)	0.69%	0.39%
Body Position
	10-item CAT	1017	50.07(10.24),(11.56,88.57)	0.39%	0%
	Full item bank	1017	50.07(10.38),(11.28,90.04)	0.29%	0%
Whole Body Mobility	5-item CAT	1004	48.5(10.88),(12.77,88.56)	0.7%	2.09%
	10-item CAT	997	48.44(10.85),(9.89,92.48)	0.3%	1.49%
	Full item bank	1017	48.51(10.87),(9.9,92.51)	0.3%	1.39%
Upper Body Function	5-item CAT	1016	50.45(9.73),(29.52,81.42)	0.88%	7.77%
	10-item CAT	1015	50.03(10.22),(27.36,83.27)	0.69%	4.03%
	Full item bank	1017	50.06(10.22),(27.06,83.8)	0.39%	3.64%
Upper Extremity Fine	5-item CAT	1017	49.08(8.81),(19.04,61.37)	21.73%	0.2%
Motor
	10-item CAT	1017	49.81(9.76),(17.31,67.52)	10.13%	0.1%
	Full item bank	1017	49.89(9.67),(16.3,67.94)	8.85%	0.1%
Wheelchair Mobility	5-item CAT	88	49.6(10.59),(18.8,79.58)	5.22%	0.87%
	Full item bank	115	50.05(11.11),(18.48,80.36)	4.35%	0.87%