TABLE II.

Results from Recalculating the Data from Hsu et al.^31*

	Orthogonal25		Oblique28		Difference to Orthogonal		RAND-3612		Difference to Orthogonal
Condition	PCS	MCS	PCS	MCS	ΔPCS	ΔMCS	PHC	MHC	ΔPCS	ΔMCS
Baseline	27.6	51.3	31.5	43.4	3.9	−7.9	30.5	42.7	2.9	−8.6
1-yr follow-up	40.6	54.6	44.0	50.4	3.4	−4.2	42.9	50.8	2.3	−3.8

^*Using the orthogonal, oblique, and RAND-36 HSI methods. The study involved use of the X STOP device for lumbar spinal stenosis. The orthogonal values differ slightly from those reported in the original study because the normative values used were marginally different. Calculations were performed on the scale means. Oblique and RAND-36 scoring removed the inflation of the MCS that occurs with orthogonal scoring in patients with severe physical disability while minimally affecting the relative change in PCS from baseline to one year.