Table 1.
Demographic characteristics, mean performance, and frequency of low test performance across CU and MCI groups.
| CU (N = 2,866) |
MCI (N = 226) |
p-value | |
|---|---|---|---|
| Age Mean (SD) | 69.82 (11.31) | 75.96 (10.28) | < 0.001a |
| Education Mean (SD) | 14.93 (2.50) | 13.62 (2.70) | < 0.001a |
| Sex (% Male) | 1433 (50.0%) | 119 (52.7%) | 0.442b |
| Short Test of Mental Status c | 35.70 (2.05) | 31.01 (2.76) | < 0.001a |
| CBB Lrn/WM Composite Mean (z) | 0.12 (0.89) | −0.77 (1.09) | < 0.001a |
| CBB Lrn/WM Composite | < 0.001b | ||
| Normal z > −1 | 2599 (91.0%) | 138 (62.2%) | |
| z ≤ −1 | 257 (9.0%) | 84 (37.8%) | |
| CBB Attn/Psychomotor Composite Mean (z) | −0.53 (0.90) | −1.34 (1.20) | < 0.001a |
| CBB Attn/Psychomotor Composite | < 0.001b | ||
| Normal z > −1 | 2089 (73.1%) | 105 (46.9%) | |
| z ≤ −1 | 768 (26.9%) | 119 (53.1%) |
a
p-values represent linear model ANOVAs for mean comparisons.
b
p-values represent Pearson’s Chi-squared test for frequency comparisons.
c
Performance is considered as part of consensus diagnosis.
Note. CU = cognitively unimpaired; MCI = mild cognitive impairment (n=174 amnestic MCI; n=52 non-amnestic MCI); CBB = Cogstate Brief Battery; Lrn/WM = Learning / Working Memory; Attn = Attention.