Table 4.

CAT Simulation on FJS Score Standard Errors in Relation to CAT Length and Correlations with Full Item Bank

CAT Length	Mean Standard Error		Correlation with Full Item Bank
	Hip	Knee	Hip	Knee
1 item	1.05	1.05	0.80	0.89
2 items	0.74	0.74	0.90	0.96
3 items	0.62	0.61	0.92	0.98
4 items	0.56	0.55	0.95	0.98
5 items	0.51	0.52	0.96	0.99
6 items	0.48	0.50	0.98	0.99
7 items	0.45	0.48	0.99	1.00
8 items	0.44	0.47	0.99	1.00
9 items	0.42	0.47	0.99	1.00
10 items	0.40	0.46	1.00	1.00
11 items	0.39		1.00
12 items	0.39		1.00