Table 1 Distribution of risk-factors in HUNT2 (1996–1998) and HUNT4 (2017–2019), Norway
From: Explaining better hearing in Norway: a comparison of two cohorts 20 years apart - the HUNT study
| Â | Women | Â | Men | Â |
|---|---|---|---|---|
HUNT2 | HUNT4 | HUNT2 | HUNT4 | |
1996–1998 | 2017–2019 | 1996–1998 | 2017–2019 | |
Age, years, mean (sd) | 48.9 (16.6) | 52.2 (16.7) | 49.4 (16.2) | 54.2 (16.7) |
Education (%) | ||||
 Primary school | 32% | 13% | 26% | 12% |
 Secondary school | 48% | 43% | 56% | 56% |
 University <  4 years | 18% | 37% | 13% | 22% |
 University >=4 years | 1% | 6% | 5% | 9% |
Recurrent ear infections (%) | ||||
 No | 72% | 80% | 77% | 85% |
 Maybe | 5% | 3% | 6% | 2% |
 Yes | 23% | 17% | 17% | 13% |
Occupational noise exposure (%) | ||||
 No never | 79% | 86% | 36% | 58% |
 < 5 h per week | 10% | 4% | 22% | 12% |
 5–15 h per week | 5% | 6% | 16% | 16% |
 > 15 h per week | 6% | 4% | 25% | 15% |
Daily smoking (%) | ||||
 No never | 48% | 56% | 39% | 56% |
 Previous | 23% | 35% | 34% | 38% |
 Current | 29% | 9% | 27% | 6% |