Table 4 Comparison of pre-shift and post-shift hearing thresholds of the study subjects
From: Otologic symptoms and hearing thresholds among a cohort of call center operators in Lagos
Hearing threshold (dB) | |||
|---|---|---|---|
Frequency (kHz) | Pre-shift Mean ± SD | Post-shift Mean ± SD | Significance (2-tailed) |
Right ear | |||
0.5 | 35.0 ± 11.0 | 35.6 ± 10.7 | |
1 | 22.4 ± 8.4 | 22.7 ± 9.6 | |
2 | 18.3 ± 9.1 | 18.5 ± 8.0 | |
3 | 17.3 ± 8.6 | 17.2 ± 8.1 | |
4 | 17.3 ± 9.4 | 16.6 ± 9.2 | |
6 | 17.9 ± 10.2 | 17.6 ± 10.5 | |
8 | 13.7 ± 8.4 | 11.3 ± 8.8 | |
PTA average | 25.4 ± 8.2 | 25.6 ± 8.1 | 0.748 |
Left ear | |||
0.5 | 33.6 ± 10.8 | 33.4 ± 11.7 | |
1 | 21.9 ± 8.6 | 22.6 ± 10.0 | |
2 | 18.2 ± 9.0 | 18.3 ± 10.0 | |
3 | 16.9 ± 8.2 | 17.6 ± 8.0 | |
4 | 16.3 ± 8.8 | 16.1 ± 8.0 | |
6 | 18.9 ± 8.4 | 19.3 ± 9.8 | |
8 | 13.9 ± 9.0 | 12.8 ± 9.2 | |
PTA average | 24.8 ± 8.5 | 24.7 ± 8.9 | 0.919 |