TABLE I.

Results from Recalculating the Data from Agren et al.^30*

	Orthogonal25		Oblique28		Difference to Orthogonal		RAND-3612		Difference to Orthogonal
	PCS	MCS	PCS	MCS	ΔPCS	ΔMCS	PHC	MHC	ΔPCS	ΔMCS
Superior group	52.6	53.3	53.4	53.8	0.8	0.5	53.5	53.8	0.9	0.5
Inferior group	38.0	48.2	39.4	44.1	1.4	−4.1	38.6	43.8	0.6	−4.4

^*Using the orthogonal, oblique, and RAND-36 HSI methods. The orthogonal values differ slightly from those reported in the original study because the normative values used were marginally different. Calculations were performed on scale means for the superior and inferior groups. The oblique and RAND-36 HSI methods decreased the inferior group’s MCS scores by 4.1 and 4.4 points, respectively. The inferior group’s PCS and superior group’s PCS and MCS were minimally affected.