Table 5.
Simple mediation analysis for the relationship between psychic anxiety symptoms and cognitive performance
|
Mediating variable (M)
|
Independent variable (X)
|
Dependent variable (Y)
|
X→M
|
M→Y
|
Indirect effect1
|
Direct effect1
|
| Sleep disturbances | HAMA-psychic symptoms | Executive function | 0.285c | -0.048 | -0.013 [-0.027, -0.001]1 | -0.027 [-0.054, 0.001] |
| Sleep disturbances | HAMA-psychic symptoms | Processing speed | 0.285c | -0.063 | -0.018 [-0.042, 0.007] | -0.037 [-0.086, 0.012] |
| Sleep disturbances | HAMA-psychic symptoms | Memory | 0.285c | -0.522c | -0.149 [-0.237, -0.063]1 | -0.075 [-0.232, 0.081] |
| Retardation | HAMA-psychic symptoms | Processing speed | 0.241c | -0.097a | -0.023 [-0.045, -0.004]1 | -0.031 [-0.077, 0.014] |
a
P < 0.05.
c
P < 0.001.
1
Significant point estimates (P < 0.05) as determined by the exclusion of zero from the confidence interval.