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Table 1 Baseline characteristics of the study population

From: Preventing cervical cancer using HPV self-sampling: direct mailing of test-kits increases screening participation more than timely opt-in procedures - a randomized controlled trial

  Directly mailed group
N = 3265
Opt-in group
N = 3264
Control group
N = 3262
  n (%) n (%) n (%)
Age (years)
 30–39 1236 (37.9) 1215 (37.2) 1251 (38.4)
 40–49 1300 (39.8) 1353 (41.5) 1342 (41.1)
 50–64 729 (22.3) 696 (21.3) 669 (20.5)
Screened in the previous screening rounda
 Not screened 1298 (39.8) 1272 (38.9) 1249 (38.3)
 Screened 1967 (60.3) 1992 (61.0) 2013 (61.7)
Screening historya
 Unscreened 604 (18.5) 595 (18.2) 567 (17.4)
 Underscreened 802 (24.6) 842 (25.8) 842 (25.8)
 Regularly screened 1859 (56.9) 1827 (56.0) 1853 (56.8)
  1. n: Number of randomized women. %: Column percentages. aSee classification of screening history for definitions
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