Table 2.

Individual item statistics^a

		Infit		Outfit
	Logit Measure (SE)	MnSq	ZStd	MnSq	ZStd	r
Standing	1.47 (0.23)	1.10	0.60	0.66	−1.30	0.52
Bend to floor	0.23 (0.19)	0.90	−0.5	0.86	−0.6	0.57
Straighten knee	0.12 (0.16)	1.27	1.8	1.07	0.5	0.60
Rise from sit	−0.04 (0.18)	0.91	−0.4	0.79	−1.0	0.60
Up/down stairs	−0.28 (0.15)	1.06	0.5	0.99	0.0	0.63
Stiffness	−0.69 (0.14)	0.95	−0.3	0.94	−0.4	0.67
Twist/pivot	−0.81 (0.14)	1.08	0.7	1.07	0.6	0.67

MnSq, mean square standardized residual; r, point-measure correlation; SE, standard error; ZStd, standardized z-scores.

^aItems listed in order of item difficulty.