Table 3.

Rasch Analysis Summary Statistics for the Full SPEED and SPEED-8 Questionnaires, CLDEQ-4, and CLDEQ-8

Item Set	Mean Rasch Person Measure (SE)	Mean Rasch Item Measure (SE)	Person Separation Index	Item Reliability	Mean Item Infit Mean Square	Principal Component Analysis First Contrast Eigenvalue
SPEED (all items)	43.0 (0.2)	43.4 (2.5)	0.42	0.99	1.0	7.7
SPEED (8-item short form)	30.4 (0.8)	48.0 (2.0)	2.03	0.98	1.0	2.4
CLDEQ-8	47.2 (1.0)	54.4 (1.8)	2.40	0.97	1.0	2.2
CLDEQ (4-item short form)	42.6 (1.6)	53.7 (2.8)	2.55	0.96	0.99	1.6