Do Depressive Traits and Hostility Predict Age-Related Decline in General Intelligence?

Table 3

Mean WAIS IQs during the lifespan from 50 to 80.

Followup	𝑁	Full scale IQ		Verbal IQ		Performance IQ
Full samples		Mean	SD	Mean	SD	Mean	SD
50-year baseline	673	98.96	14.40	98.19	14.21	99.12	14.22
60-year followup	513	98.84	14.33	99.21	14.59	97.65	13.80
70-year followup	136	94.90	14.12	96.22	13.71	93.40	14.37
80-year followup	184	87.66	15.49	92.27	15.64	83.46	14.78
80-year sample ^1	184
50-year baseline		102.10	13.79	100.85	13.84	102.31	13.28
80-year followup		87.66	15.49	92.27	15.63	83.46	14.78
Difference		14.44	8.88	8.58	8.75	18.85	10.43
Retest correlation		0.82		0.83		0.73

¹Data are for the 184 participants who completed the WAIS at both the 50- and 80-year studies.