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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

  Women   Men  
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%