Table 2.
Comparison of mean DPOAE thresholds at 8 kHz among the groups on the throughout the study
| 8 kHz DPOAE | Control1 Min–Max (median) Mean ± SD | Papaverine2 Min–Max (median) Mean ± SD | Piracetam3 Min–Max (median) Mean ± SD | P a | P b |
|---|---|---|---|---|---|
| Before noise trauma (n = 6) | 17.4–20.3 (18.6) | 16.7–25.2 (19.2) | 17.1–24.1 (21.7) | 0.244 | |
| 18.65 ± 1.10 | 20.19 ± 2.99 | 20.99 ± 2.49 | |||
| Immediately after the trauma (n = 6) | 4.8–9.8 (7.9) | 7.8–11.7 (9) | 7.9–11.1 (9.7) | 0.182 | |
| 7.89 ± 1.81 | 9.27 ± 1.42 | 9.61 ± 1.36 | |||
| Day 3 (n = 6) | 9–12.9 (11) | 12.9–19.8 (15.2) | 14.3–19.7 (16.9) | 0.003* | 1,2 P = 0.004** |
| 11.19 ± 1.48 | 15.84 ± 2.42 | 16.94 ± 2.63 |
1,3
P = 0.004** 2,3 P = 0.748 |
||
| Day 7 (n = 5) | 10.6–15.9 (13.2) | 13.8–23.5 (17.5) | 15.5–22.4 (20.8) | 0.023* | 1,2 P = 0.016* |
| 13.32 ± 1.91 | 18.13 ± 3.66 | 19.57 ± 2.75 |
1,3
P = 0.028* 2,3 P = 0.465 |
||
| Day 14 (n = 4) | 14.3–15.4 (15.3) | 15.1–24.7 (20.1) | 20.5–23.7 (21.4) | 0.059 | 1,2 P = 0.200 |
| 15.06 ± 0.51 | 20.02 ± 4.04 | 21.73 ± 1.36 |
1,3
P = 0.029* 2,3 P = 0.486 |
a
Kruskal–Wallis test. bMann–Whitney U test. *P < 0.05. **P < 0.01.