Table 3.

Empirical CAT simulation

	T-score, mean (SD)	SEM, mean (SD)	Correlation with full item bank	Floor (%)	Ceiling (%)
Random-10 items	51.89 (14.90)	5.50 (1.80)	0.92	0.4	18.7
CAT-5 items	52.10 (14.92)	5.50 (1.80)	0.92	0.7	15.6
CAT-10 items	54.27 (17.14)	4.00 (1.20)	0.96	0.3	13.1
CAT-15 items	54.43 (17.77	3.60 (130)	0.94	0.1	12.8
PF-10				2.3	38.1

Random-10 administration of 10 random item bank items; CAT computerized adaptive test; PF-10 36-Item Short-form Health Survey, physical functioning scale; SEM standard error of measurement