Table 2.

Item Parameters of the NCS in the United States and the United Kingdom.

	United Kingdom						United States
Item	a	b1	b2	b3	b4	b(m)	a	b1	b2	b3	b4	b(m)
NCS01	2.484	−1.885	−0.840	−0.164	1.197	−.423	2.145	−1.923	−0.800	−0.054	1.599	−.294
NCS02	2.588	−1.822	−0.967	−0.386	1.004	−.543	2.140	−2.213	−0.950	−0.197	1.395	−.491
NCS03	3.198	−2.153	−1.180	−0.765	0.394	−.926	2.420	−2.572	−1.385	−0.766	0.579	−1.036
NCS04	3.105	−2.037	−0.940	−0.412	0.756	−.658	2.116	−2.371	−1.172	−0.451	0.993	−.750
NCS05	2.313	−2.334	−1.148	−0.683	0.565	−.900	1.648	−2.678	−1.395	−0.720	0.814	−.995
NCS06	2.032	−1.815	−0.821	−0.137	1.339	−.359	1.736	−1.837	−0.642	0.244	2.001	−.059
NCS07	1.899	−2.284	−0.944	−0.373	0.800	−.700	1.459	−2.420	−0.970	−0.332	1.284	−.609
NCS08	1.401	−2.126	−0.502	0.405	2.175	−.012	0.884	−3.426	−0.733	0.845	3.608	.074
NCS09	1.796	−1.846	−0.365	0.226	1.536	−.112	1.435	−2.258	−0.322	0.422	1.926	−.058
NCS10	2.229	−2.248	−1.381	−0.783	0.635	−.944	1.828	−2.187	−1.183	−0.398	1.342	−.607
NCS11	2.400	−2.274	−1.385	−0.839	0.601	−.974	2.131	−2.604	−1.479	−0.749	0.963	−.967
NCS12	2.358	−2.393	−1.381	−0.905	0.343	−1.084	1.546	−3.183	−1.551	−0.794	0.862	−1.167
NCS13	1.714	−2.089	−0.975	−0.142	1.472	−.434	2.043	−1.801	−0.660	0.085	1.561	−.204
NCS14	1.755	−2.336	−1.463	−0.774	0.833	−.935	1.409	−2.432	−1.157	−0.259	1.441	−.602
NCS15	2.459	−2.132	−1.065	−0.351	0.874	−.669	1.913	−2.470	−0.976	−0.071	1.355	−.541
NCS16	1.581	−1.820	−0.649	0.046	1.412	−.253	1.065	−2.208	−0.639	0.448	2.535	.034
NCS17	1.569	−2.671	−1.116	−0.533	0.852	−.867	1.161	−2.968	−1.015	−0.185	1.657	−.628
NCS18	0.919	−3.527	−1.862	−0.986	1.450	−1.231	0.590	−5.385	−2.166	−0.887	3.063	−1.344

Note. NCS = Need for Cognition Scale. a = discrimination; b1-b4 = threshold; b(m) = means across b1-b4. Items selected for the final version are given in boldface.