Table 3.
Description of intra-subject and between-group amplitudes.
| Amplitude (µV) | Young adult group | Adult group | Elderly group | p Value |
|---|---|---|---|---|
| Mean ± SD | Mean ± SD | Mean ± SD | ||
| Median (P25; P75) | Median (P25; P75) | Median (P25; P75) | ||
| P1 (without masking) | 4.78 ± 2.69 | 6.38 ± 2.72 | 5.85 ± 2.08 | pa = 0.312 |
| 4.38 (2.99; 5.64) | 5.17 (4.42; 7.91) | 5.36 (4.12; 7.81) | ||
| AP1 (Delta-t 64 ms) | 3.69 ± 1.13 | 3.74 ± 1.62 | 3.23 ± 2.30 | pa = 0.520 |
| 3.76 (2.63; 4.73) | 3.65 (2.64; 4.84) | 2.14 (1.71; 5.00) | ||
| p Value | p(5) = 0.275 | p(4) = 0.022c | p(4) = 0.028c | |
| N1 (without masking) | 8.22 ± 4.12 | 9.77 ± 3.73 | 9.70 ± 2.63 | pb = 0.551 |
| 7.66 (5.06; 12.11) | 8.67 (6.61; 14.00) | 10.12 (7.44; 12.03) | ||
| N1 (Delta-t 64 ms) | 4.11 ± 2.45 | 4.23 ± 1.92 | 3.13 ± 1.07 | pa = 0.348 |
| 3.69 (2.48; 4.67) | 3.83 (3.20; 4.89) | 2.95 (2.40; 3.93) | ||
| p Value | p(4) = 0.007c | p(4) = 0.001c | p(4) < 0.001c | |
| P2 (without masking) | 5.79 ± 3.12 | 5.23 ± 3.15 | 6.89 ± 2.77 | pa = 0.221 |
| 4.55 (3.56; 8.83) | 4.15 (3.26; 7.02) | 6.09 (4.48; 9.80) | ||
| P2 (Delta-t 64 ms) | 3.68 ± 2.47 | 2.97 ± 2.25 | 2.83 ± 1.13 | pa = 0.658 |
| 2.96 (1.80; 4.99) | 2.08 (1.44; 4.08) | 2.81 (2.05; 3.23) | ||
| p Value | p(4) = 0.009c | p(4) = 0.043c | p(4) = 0.003c |
µV, microvolts; SD, standard deviation.
a
Kruskal Wallis Test with Conover’s all-pairs comparison.
b
F-Test (ANOVA) with Tamhane’s multiple comparisons.
c
Significant difference at the 5.0% level.