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Table 2 Participation rate, stratified by age group, gender, purchase of respiratory medicine, education level, income and occupational status

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

  Total Intervention Control Participation
eligible participants participants rate differencea
(N) N (%) N (%) (95% CI)
Total 4407 1172 (53.4) 1151 (52%) 1.4 (−1.9; 4.7)
Age groups (years)
 30–34 912 221 (48.6) 212 (46.6%) 2.2 (−4.8; 9.2)
 35–39 1103 306 (54.4) 273 (50.6%) 3.8 (−2.5;10.1)
 40–44 1215 307 (51.8) 322 (51.8%) 0.0 (−6.0; 6.0)
 45–50 1177 338 (58.0) 344 (57.9) 0.1 (−5.9; 6.1)
Gender
 Female 2167 590 (55.0) 585 (53.5) 1.5 (−2.7; 5.7)
 Male 2240 582 (51.9) 566 (50.6) 1.3 (−2.8; 5.5)
Medicineb
 No 4015 1082 (54.1) 1058 (52.5) 1.5 (−1.9; 5.0)
 Yes 392 90 (46.6) 93 (46.7) −0.1 (− 10.1; 9.9)
Education (years)
 0–10 (low) 745 155 (41.3) 139 (37.6) 3.8 (−3.5; 11.0)
 10–15 (medium) 2209 574 (52.7) 607 (54.2) −1.5 (−5.9; 3.0)
 16+ (high) 1355 421 (62.5) 387 (56.8) 5.6 (0.0; 11.3)
Income (tertiles)
 Low (0–207) 1429 299 (42.2) 307 (42.6) −0.5 (−6.1; 5.2)
 Middle (208–273) 1446 406 (55.9) 363 (50.4) 5.5 (−0.3; 11.3)
 High (274-?) 1532 467 (61.5) 481 (62.2) −0.7 (−6.3; 4.9)
Occupation
 Employed 3428 971 (56.5) 946 (55.4) 1.1 (−2.6; 4.8)
 Self-employed 175 51 (60.0) 50 (55.6) 4.4 (−10.3; 19.1)
 Unemployed/benefits 122 21 (38.2) 27 (40.3) −2.1 (−19.9; 15.6)
 Social welfare recipient 615 118 (39.1) 113 (36.1) 3.0 (−4.9; 10.9)
 Othersc 67 11 (33.3) 15 (44.1) −10.8 (−35.1; 13.5)
  1. aAdjusted for cluster size
  2. bPurchase of respiratory medicine in the last 2 years
  3. cOthers include a non-working person from a family relying on one income only