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Table 1 Baseline characteristics of the study population

From: The effect on participation rates of including focused spirometry information in a health check invitation: a cluster-randomised trial in Denmark

  Control Intervention Total Missing
N (%) N (%) N (%) N
Total 2258 (50.3) 2231 (49.7) 4489 (100.0) 0/4489
Sex (male) 1142 (50.6) 1143 (51.2) 2285 (50.9) 0/4489
Age groups (years)
 30–34 463 (20.5) 463 (20.8) 926 (20.6)  
 35–39 546 (24.2) 572 (25.6) 1118 (24.9)  
 40–44 637 (28.2) 605 (27.1) 1242 (27.7)  
 45–50 612 (27.1) 591 (26.5) 1203 (26.8) 0/4489
Education (years)
 0–10 (low) 378 (17.1) 386 (17.8) 764 (17.4)  
 10–15 (medium) 1143 (51.6) 1104 (50.8) 2247 (51.2)  
 15- (high) 692 (31.3) 684 (31.5) 1376 (31.4) 102/4489
Income, 1000 DKK
 Low tertile (0–207) 737 (32.6) 723 (32.4) 1460 (32.5)  
 Middle tertile (208–273) 734 (32.5) 740 (33.2) 1474 (32.8)  
 High tertile (274-?) 787 (34.9) 768 (34.4) 1555 (34.6) 0/4489
Occupational status
 Employed 1745 (77.3) 1746 (78.3) 3491 (77.8)  
 Self-employed 91 (4.0) 86 (3.9) 177 (3.9)  
 Unemployed/benefits 68 (3.0) 55 (2.5) 123 (2.7)  
 Social welfare recipient 317 (14.0) 310 (13.9) 627 (14.0)  
 Othersb 37 (1.6) 34 (1.5) 71 (1.6) 0/4489
Medicine (Yes)a 205 (9.1) 198 (8.9) 403 (9.0) 0/4489
  1. aPurchase of respiratory medicine in the last 2 years
  2. b Others include a non-working person from a family relying on one income only