|  | Model 1: Crudea |  | Model 2: Age-adjusteda |  | Model 3: Age- and SES-adjusteda |  | Model 4: Full factoriala,b |
---|---|---|---|---|---|---|---|---|
Independent variable | Â | OR (95% CI) | Â | OR (95% CI) | Â | OR (95% CI) | Â | OR (95% CI) |
Age (years) | Â | Â | Â | Â | Â | Â | Â | Â |
 20-24 |  | 1 |  |  |  | 1 |  | 1 |
 25-34 |  | 1.84 (1.13-3.00) |  |  |  | 1.98 (1.21-3.23) |  | 1.95 (1.19-3.18) |
 35-44 |  | 4.70 (2.99-7.39) |  |  |  | 4.90 (3.09-7.76) |  | 4.62 (2.92-7.32) |
 45-54 |  | 8.94 (5.72-13.97) |  |  |  | 9.13 (5.79-14.38) |  | 8.29 (5.26-13.07) |
 55-64 |  | 16.93 (10.87-26.35) |  |  |  | 16.76 (10.67-26.33) |  | 15.32 (9.75-24.08) |
SES | Â | Â | Â | Â | Â | Â | Â | Â |
 Professional work level |  | 1 |  | 1 |  |  |  | 1 |
 Intermediate non-manual work level |  | 1.44 (1.12-1.86) |  | 1.44 (1.11-1.86) |  |  |  | 1.38 (1.06-1.80) |
 Assistant non-manual work level |  | 2.49 (1.93-3.21) |  | 2.38 (1.83-3.08) |  |  |  | 2.27 (1.75-2.95) |
 Self-employed non-professional work level |  | 1.43 (0.99-2.06) |  | 1.24 (0.85-1.80) |  |  |  | 1.18 (0.81-1.72) |
 Skilled manual work level |  | 2.59 (2.00-3.36) |  | 2.83 (2.17-3.68) |  |  |  | 2.55 (1.95-3.33) |
 Unskilled/semiskilled manual work level |  | 3.73 (2.94-4.74) |  | 4.27 (3.34-5.46) |  |  |  | 3.74 (2.91-4.80) |
 Students |  | 0.15 (0.07-0.31) |  | 0.47 (0.22-0.99) |  |  |  | 0.41 (0.19-0.87) |
Self-reported hearing difficulties | Â | Â | Â | Â | Â | Â | Â | Â |
 No |  | 1 |  | 1 |  | 1 |  | 1 |
 Yes |  | 2.38 (2.03-2.79) |  | 1.86 (1.57-2.19) |  | 1.70 (1.43-2.01) |  | 1.68 (1.42-1.99) |
Type of living area | Â | Â | Â | Â | Â | Â | Â | Â |
 Urban |  | 1 |  | 1 |  | 1 |  | 1 |
 Semi-urban |  | 1.37 (1.19-1.58) |  | 1.30 (1.12-1.50) |  | 1.15 (0.99-1.34) |  | 1.17 (1.01-1.37) |
 Sparsely populated |  | 1.86 (1.61-2.15) |  | 1.65 (1.42-1.92) |  | 1.34 (1.15-1.57) |  | 1.39 (1.19-1.63) |
Country of birth | Â | Â | Â | Â | Â | Â | Â | Â |
 Sweden |  | 1 |  | 1 |  | 1 |  | 1 |
 Elsewhere |  | 1.32 (1.13-1.55) |  | 1.39 (1.17-1.64) |  | 1.29 (1.08-1.53) |  | 1.37 (1.15-1.63) |