Table 2.
Description of intra-subject and between-group latencies.
| Latencies (ms) | 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) | 36.05 ± 0.03 | 54.40 ± 8.59 | 55.00 ± 11.34 | pd < 0.001a, b |
| 36.05 (36.02; 36.07) | 52.50 (49.00; 57.75) | 53.50 (44.75; 65.00) | ||
| P1 (Delta-t 64 ms) | 272.30 ± 55.71 | 272.80 ± 25.56 | 323.70 ± 49.27 | pf = 0.025b, c |
| 260.00 (236.25; 302.25) | 273.00 (246.75; 302.50) | 327.00 (269.00; 365.75) | ||
| p Value | p(4) < 0.001g | p(4) < 0.001g | p(4) < 0.001g | |
| N1 (without masking) | 96.70 ± 10.48 | 99.90 ± 14.91 | 106.30 ± 20.22 | pe = 0.598 |
| 98.00 (86.75; 104.00) | 98.50 (86.50; 109.50) | 98.50 (91.00; 118.00) | ||
| N1 (Delta-t 64 ms) | 321.90 ± 61.05 | 326.80 ± 33.08 | 371.30 ± 35.12 | pe = 0.039b, c |
| 325.00 (275.50; 357.00) | 326.50 (305.75; 353.75) | 357.50 (343.50; 403.50) | ||
| p Value | p(4) < 0.001g | p(4) < 0.001g | p(4) < 0.001g | |
| P2 (without masking) | 167.40 ± 14.25 | 181.50 ± 29.01 | 176.40 ± 22.66 | pd = 0.388 |
| 173.50 (150.75; 179.00) | 174.00 (169.25; 200.50) | 181.00 (152.75; 193.50) | ||
| P2 (Delta-t 64 ms) | 385.50 ± 69.69 | 398.80 ± 31.96 | 436.70 ± 38.66 | pd = 0.074 |
| 391.00 (326.00; 426.50) | 399.50 (373.00; 427.50) | 449.50 (405.75; 464.00) | ||
| p Value | p(4) < 0.001g | p(4) < 0.001g | p(4) < 0.001g |
ms, milliseconds; SD, standard deviation.
a
Statistically significant difference of the means between the young adult and adult groups.
b
Statistically significant difference of the means between the young adult and elderly groups.
c
Statistically significant difference of the means between the adult and elderly groups.
d
F-Test (ANOVA) with Tamhane’s multiple comparisons.
e
Kruskal Wallis test with Conover’s all-pairs comparison.
f
F-Test (ANOVA) with Tukey’s multiple comparisons.
g
Significant difference at the 5.0% level.