Table 2: The lifetime prevalences of psychiatric disorders other than dementia in centenarians versus octogenarian control group in GCS [3] do not differ.

D i s e a s e Octogenarians (%)Centenarians (%)Total #

Dementia13 ( 1 4 % ) 136 ( 5 7 % ) 321
Depression14 (17.5%) 36 (14.8%)324
Anxiety 5 (6.3%) 17 (7.0%)324
Psychosis 1 (1.3%) 6 (2.5%)324
Total33 185324

The row categories are not mutually exclusive, but dementia tends to be positively associated with psychiatric disorders (Figure 1(b)). The association of Dementia with age (Control versus Centenarian) is significant with 𝑃 < . 0 0 0 0 1 by Fisher’s Exact test [14] for a 2 × 2 table, but the associations of Depression, Anxiety, and Psychosis individually with age (Control versus Centenarian) are not significant with 𝑃 > . 0 5 . If we combine mental health across Depression, Anxiety, and Psychosis and test for association with age (Control versus Centenarian) by Fisher’s Exact test [14] for a 2 × 2 table, the association of the aggregate variable indicating Depression, Anxiety, or Psychosis with age is not significant. The percents reported in this table are among 80 octogenarians or 244 centenarians.