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Table 2 Sociodemographic characteristics of the study sample

From: Road traffic noise, noise sensitivity, noise annoyance, psychological and physical health and mortality

  N (2398 at baseline)
or mean (standard deviation)
Percentage
Covariates
Age
 45–54 years 840 35.3
 55–60 years 767 31.8
  > 60 years 791 32.9
Marital Status
 Widowed, divorced, separated 177 7.4
 Single 122 5.1
 Married 2099 87.5
Registrar General Social Class
 Non-manual 780 32.6
 Manual 1610 67.4
Employment status
 Employed 1107 43.6
 Self-employed 152 6.3
 Unemployed 362 15.1
 Retired 770 32.3
Smoking status
 Non-smoker 431 18.0
 Ex-smoker 907 37.9
 Current smoker 1054 44.1
 BMI 26.4 (3.64) Not applicable
 Alcohol consumption ccs/week 15,414 (199) Not applicable
 Physical activity 130,252 (134355) Not applicable
Noise at work
 1 747 32.1
 2 878 37.8
 3 700 30.1
Noise variables
Noise exposure (LAeq 16 h)   
 51-55dBA 2101 72.6
 56-60dBA 247 8.5
 61-65dBA 374 12.9
 66-70dBA 174 6.0
Noise sensitivity
 Lowest tertile 808 34.6
 Mid tertile 773 33.1
 Highest tertile 753 32.3
Noise annoyance
 Never, Seldom, Sometimes 2262 96.4
 Often, Always 84 3.6
Cardiovascular variables
CHD prior to phase 2
 No 2345 97.8
 Yes 53 2.2
IHD mortality between phase 2 and phase 4
 No 1976 82.4
 Yes 422 17.6
IHD morbidity between phase 2 and phase 4
 No 1659 69.2
 Yes 739 30.8
Psychological variables
GHQ2
 No 7177 77.7
 Yes 490 22.3
GHQ3
 No 1319 76.2
 Yes 410 23.8
GHQ4
 No 1124 75.3
 Yes 369 24.7