Table 2.

Scores in Relation to Number of Chronic Conditions and General Health Rating

			Item Bank		Simulated 10 Item CAT		20¹ Item Static Form		10 Item Static Form		5 Item Static Form		SF-36 PF-10 Scale		HAQ-DI
	Group	N	M	SD	M	SD	M	SD	M	SD	M	SD	M	SD	M	SD
General Health	Poor	27	35.1	9.4	35.5	10.7	27.5	15.4	27.8	12.6	31.5	9.3	26.4	12.1	76.2	18.7
	Fair	99	42.8	8.8	43.2	8.9	41.5	13.6	41.2	12.5	41.3	10.9	38.9	11.9	56.2	14.2
	Good	301	48.7	8.8	48.7	8.7	49.5	8.2	49.0	8.7	48.5	9.3	45.5	10.6	50.0	8.0
	Very good	278	54.4	7.6	54.6	7.8	53.6	5.8	53.8	6.0	54.0	6.8	51.9	6.9	47.1	5.8
	Excellent	114	58.0	8.0	58.2	8.2	54.8	4.2	55.3	5.1	55.7	6.2	53.6	6.5	46.4	3.1
		F(rv)²	86.2 (1.00)		82.6 (0.96)		91.3 (1.06)		91.5 (1.06)		84.1 (0.98)		76.9 (0.89)		77.6 (0.90)
Age	<=20	32	56.4	7.6	56.9	7.3	54.6	8.7	55.2	8.5	56.6	6.8	53.2	6.7	47.6	9.3
	20–39	241	55.4	8.4	55.8	8.5	53.9	6.1	54.2	6.4	54.7	6.9	51.5	8.1	47.4	5.9
	40–59	271	50.8	10.2	51.1	10.1	49.8	11.1	49.8	10.8	50.0	10.6	47.7	11.6	50.7	11.6
	>=60	274	46.0	8.8	45.9	8.9	46.4	10.2	46.0	10.2	45.2	9.6	43.4	11.2	51.7	10.6
		F(rv)²	50.4 (1.00)		55.8 (1.11)		27.0 (0.54)		32.0 (0.63)		47.2 (0.94)		24.9 (0.49)		8.2 (0.16)
Chronic Conditions	None	356	55.6	8.1	55.8	8.3	53.9	6.0	54.2	6.5	54.6	7.2	52.2	7.5	47.2	5.9
	One	179	51.7	8.2	51.9	8.5	51.9	6.7	52.1	6.6	51.6	7.9	49.5	8.2	47.7	5.4
	Two or more	284	44.0	9.1	44.3	9.1	43.6	12.6	43.1	11.9	43.1	10.5	39.9	12.4	55.4	13.9
		F(rv)²	147.3 (1.00)		139.8 (0.95)		102.9 (0.70)		122.1 (0.83)		137.3 (0.93)		118.7 (0.81)		60.2 (0.41)

For better illustration of T-score transformation of sum scores for the static forms: 20 items: y_i = (((x_i − 4.4367)/.50840) *10) + 50; 10 items: y_i = (((x_i − 4.4600)/.66385) *10) + 50; 5 items: y_i = (((x_i − 4.0155)/1.02460) *10) + 50, and the HAQ-DI y_i = (((x_i − 2.5354)/5.71807) * 10) + 50, SF-36 norm-based scoring as recommended by the test authors

F: ANOVA F-value and rv: relative validity (F-value derived by other instrument/F-value derived by IRT bank score)