Table 2.

Four Latent Class Model of Cognitive Performance at Age 65 (Wisconsin Longitudinal Study, 2004, N = 3,713)

	Latent class
Assigned label	Overall low	Overall high	High fluency	High episodic memory
Latent class prevalences	.22	.29	.23	.26
Item-response probabilities
Letter fluency
Lowest 25%	.39	.03	.02	.31
25%–50%	.41	.12	.14	.37
50%–75%	.17	.27	.30	.29
Highest 25%	.03	.58	.54	.03
Category fluency
Lowest 25%	.52	.07	.09	.29
25%–50%	.24	.12	.15	.27
50%–75%	.20	.29	.37	.33
Highest 25%	.04	.51	.38	.12
Immediate recall
Lowest 25%	.55	.00	.19	.00
25%–50%	.34	.03	.37	.14
50%–75%	.11	.18	.32	.30
Highest 25%	.00	.79	.12	.57
Delayed recall
Lowest 25%	.59	.00	.32	.06
25%–50%	.27	.03	.34	.10
50%–75%	.15	.14	.33	.22
Highest 25%	.00	.83	.01	.61