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Table 2 The association (odds ratio) between selected sociodemographic variables and attendance (yes/no) in the Oslo Health Study 2000–2001. Crude odds ratio and adjusted for all variables by logistic regression.

From: The Oslo Health Study: The impact of self-selection in a large, population-based survey

  Invited N Attendance (%) Crude odds ratio ** Adjusted odds ratio ** (95% CI)
Sex      
   Men 19839 42.4 Ref. Ref.  
   Women 21035 49.3 1.32 1.51 (1.44–1.59)
  40874 45.9    
Age      
   30 11404 36.1 Ref. Ref.  
   40+45 14668 45.0 1.45 1.38 (1.30–1.47)
   59–60 8072 55.4 2.20 2.37 (2.19–2.55)
   75–76 6730 53.2 2.02   
  40874 45.9    
Marital status      
   Unmarried 14067 39.1 Ref. Ref.  
   Married 18083 51.6 1.66 1.31 (1.23–1.39)
   Widowed 2545 48.7 1.48 1.08 (0.90–1.30)
   Separated/divorced 5900 43.2 1.19 0.89 (0.82–0.96)
   Reg. partnership 111 46.8 1.38 1.38 (0.92–2.06)
  40706 45.8    
Country of birth      
   Norway 33519 47.2 Ref. Ref.  
   Western countries 2422 42.2 0.82 1.06 (0.96–1.17)
   Non-western 4933 39.3 0.72 0.99 (0.92–1.07)
  40874 45.9    
Residential region      
   Outer east 16696 50.3 Ref. Ref.  
   Outer west 10167 49.9 0.98 0.75 (0.71 – 0.80)
   Inner west 5939 40.4 0.67 0.62 (0.58 – 0.67)
   Inner east 6215 40.2 0.66 0.79 (0.74 – 0.85)
  39017 47.1    
Education      
   Lower secondary 6766 39.5 Ref. Ref.  
   Upper secondary 16808 46.5 1.33 1.42 (1.32 – 1.53)
   College/University 14906 48.7 1.46 1.86 (1.71 – 2.01)
   Unknown 1504 24.2 0.49 0.58 (0.50 – 0.68)
  39984 45.3    
Total income (NOK)      
   < 100 000 5014 34.3 Ref. Ref.  
   - 199 000 9490 42.9 1.44 1.46 (1.33 – 1.60)
   - 399 000 19473 49.2 1.85 1.82 (1.68 – 1.98)
   400 000+ 6178 44.3 1.52 1.44 (1.30 – 1.59)
  40155 45.1    
Disability benefit*      
   No 30918 44.0 Ref. Ref.  
   Yes 2689 38.7 0.80 0.66 (0.60 – 0.73)
  33607 43.6    
Single parent benefit*      
   No 33138 43.7 Ref. Ref.  
   Yes 469 35.8 0.72 0.89 (0.73 – 1.09)
  33607 43.6    
Rehabilitation benefit*      
   No 33156 43.6 Ref. Ref.  
   Yes 451 42.4 0.95 0.93 (0.76 – 1.14)
  33607 43.6    
Sickness benefit*      
   No 32166 43.5 Ref. Ref.  
   Yes 1441 44.9 1.06 0.89 (0.79 – 1.00)
  33607 43.6    
Unemployment benefit*      
   No 32716 43.7 Ref. Ref.  
   Yes 891 38.5 0.81 0.95 (0.82 – 1.10)
  33607 43.6    
  1. Numbers differ a little from text due to updating of data register with respect to number of deaths before screening * The numbers are based on invited individuals below 75 years, to be able to include social security benefits ** The crude odds ratios are based on the total sample, while the adjusted odds ratios are estimated based on the total sample excluding those 75–76 years of age to be able to include social security benefits in the model.