Table 3.

Four Latent Class Model of Cognitive Performance at Age 72 (Wisconsin Longitudinal Study, 2011, N = 3,713)

	Latent class
Assigned label	Overall low	Older overall high	Older high fluency	Older high episodic memory
Latent class prevalences	.26	.22	.30	.22
Item-response probabilities
Letter fluency
Lowest 25%	.39	.03	.03	.29
25%–50%	.41	.20	.27	.56
50%–75%	.17	.24	.33	.15
Highest 25%	.03	.44	.37	.00
Category fluency
Lowest 25%	.52	.10	.16	.36
25%–50%	.24	.13	.20	.26
50%–75%	.20	.45	.40	.32
Highest 25%	.04	.32	.23	.04
Immediate recall
Lowest 25%	.55	.01	.23	.00
25%–50%	.34	.09	.38	.27
50%–75%	.11	.64	.38	.65
Highest 25%	.00	.27	.01	.08
Delayed recall
Lowest 25%	.59	.01	.34	.06
25%–50%	.27	.03	.36	.15
50%–75%	.15	.13	.29	.33
Highest 25%	.00	.83	.01	.46