Table 11.

Item parameters for the 11 PedsQL^™ items as input into the Lord-Wingersky 2.0 algorithm

	Slopes								Intercepts
Item	η1	η2	ξ1	ξ2	ξ3	ξ4	ξ5	ξ6	1	2	3	4
1	0	2.31	0	0	0	0	0	0	.77	−.56	−3.19	−5.50
2	0	3.90	0	2.37	0	0	0	0	1.50	−1.05	−5.83	−8.24
3	0	4.09	3.85	0	0	0	0	0	−2.04	−4.89	−9.10	−12.15
4	0	1.70	0	0	0	0	0	0	−.48	−1.20	−2.84	−3.68
5	0	2.25	0	0	0	0	0	0	2.05	.69	−2.14	−3.82
6	0	2.63	0	0	0	0	0	2.52	4.44	2.17	−1.70	−4.08
7	0	3.42	0	0	2.04	0	0	0	1.79	−.65	−4.59	−7.02
8	0	1.07	0	0	0	0	0	0	1.64	.55	−1.29	−2.29
9	0	3.11	0	0	0	0	1.66	0	−.17	−1.88	−4.11	−5.82
10	0	3.36	0	0	0	4.06	0	0	−1.91	−4.02	−7.34	−9.21
11	0	2.19	0	0	0	0	0	0	.14	−1.18	−3.44	−5.02