Point estimates of effect (B) and SE, ORs, 95% CIs of OR from binary logistic regression models for hearing-related symptom outcomes (binary dependent variables) among personnel in an obstetrics ward
| Dependent variables | Explanatory variables | B (SE) | OR (95% CI) | p Value |
|---|---|---|---|---|
| Sound-induced auditory fatigue | ||||
| Model 1 | Occupational noise index | 0.04 (0.02) | 1.04 (1.00 to 1.07) | 0.031 |
| Model 3 | Occupational noise index | 0.04 (0.02) | 1.04 (1.00 to 1.08) | 0.027 |
| Work-related stress | 0.96 (0.42) | 2.62 (1.15 to 5.98) | 0.022 | |
| Model 4 | Occupational noise index | 0.04 (0.02) | 1.04 (1.01 to 1.08) | 0.026 |
| Noise annoyance at work | 1.73 (0.47) | 5.67 (2.25 to 14.27) | <0.001 | |
| Model 5 | Occupational noise index | 0.04 (0.02) | 1.04 (1.01 to 1.08) | 0.025 |
| Work-related stress | 0.87 (0.45) | 2.39 (0.99 to 5.79) | 0.053 | |
| Noise annoyance at work | 1.66 (0.48) | 5.25 (2.05 to 13.42) | 0.001 | |
| Tinnitus | ||||
| Model 1 | Occupational noise index | 0.04 (0.02) | 1.04 (1.00 to 1.09) | 0.049 |
| Model 3 | Occupational noise index | 0.04 (0.02) | 1.04 (1.00 to 1.09) | 0.046 |
| Work-related stress | −0.43 (0.60) | 0.65 (0.20 to 2.10) | 0.470 | |
| Model 4 | Occupational noise index | 0.04 (0.02) | 1.05 (1.00 to 1.09) | 0.038 |
| Noise annoyance at work | 0.56 (0.58) | 1.85 (0.56 to 5.46) | 0.335 | |
| Sound sensitivity | Occupational noise index | 0.01 (0.02) | 1.03 (0.97 to 1.06) | 0.570 |
| Poor hearing | Occupational noise index | 0.00 (0.02) | 1.00 (0.96 to 1.04) | 0.985 |
| Hearing loss | Occupational noise index | 0.00 (0.03) | 1.00 (0.95 to 1.06) | 0.995 |
| Difficulty perceiving speech | Occupational noise index | 0.01 (0.02) | 1.01 (0.98 to 1.05) | 0.461 |
| Any symptom* | Occupational noise index | 0.02 (0.02) | 1.02 (0.99 to 1.05) | 0.273 |
All dependent variables were analysed in separate models. Manual sequential analysis was adopted, adding work-related stress and noise annoyance at work, and adding an interaction term if the initial model was statistically significant (p<0.05).
*Any symptom was constructed as a binary variable including all those who reported either sound-induced auditory fatigue, tinnitus, sound sensitivity, poor hearing, hearing loss or difficulty perceiving speech. Bold typeface indicates statistical significance at p<0.05.