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Table 2 Participation rate, stratified by age groups and screening history

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      Opt-in group     Control group
   Self-sampling Cytology Totala     Self-sampling Cytology Totala     Cytology
  N n (%) n (%) n (%) PD1
(95% CI)
RR1 (95% CI) N n (%) n (%) n (%) PD2
(95% CI)
RR2 (95% CI) N n (%)
Age (years)
 30–39 1236 231 (18.7) 264 (21.4) 495 (40.0) 13.4 (9.8–17.1) 1.50 (1.34–1.69) 1215 81 (6.7) 316 (26.0) 397 (32.7) 6.1 (2.5–9.7) 1.23 (1.09–1.39) 1251 333 (26.6)
 40–49 1300 271 (20.9) 260 (20.0) 531 (40.8) 13.3 (9.8–16.9) 1.49 (1.33–1.66) 1353 126 (9.3) 326 (24.1) 452 (33.4) 5.9 (2.4–9.4) 1.21 (1.08–1.36) 1342 369 (27.5)
 50–64 729 133 (18.2) 83 (11.4) 216 (29.6) 11.5 (7.1–15.9) 1.63 (1.35–1.99) 696 63 (9.1) 97 (13.9) 160 (22.9) 4.9 (0.6–9.2) 1.27 (1.03–1.57) 669 121 (18.1)
 Total 3265 635 (19.4) 607 (18.6) 1242 (38.0) 12.8 (10.6–15.0) 1.51 (1.40–1.62) 3264 270 (8.3) 739 (22.6) 1009 (30.9) 5.7 (3.5–7.9) 1.23 (1.13–1.32) 3262 823 (25.2)
Screened in previous screening roundb
 Not screened 1298 203 (15.6) 97 (7.5) 300 (23.1) 14.9 (12.2–17.7) 2.83 (2.29–3.49) 1272 76 (5.9) 95 (7.5) 171 (13.4) 5.2 (2.9–7.7) 1.65 (1.30–2.08) 1249 102 (8.2)
 Screened 1967 432 (21.9) 510 (25.9) 942 (47.9) 12.1 (9.0–15.1) 1.34 (1.24–1.44) 1992 194 (9.7) 644 (32.3) 838 (42.1) 6.3 (3.2–9.3) 1.17 (1.09–1.27) 2013 721 (35.8)
Screening historyb
 Unscreened 604 81 (13.4) 39 (6.5) 120 (19.9) 12.6 (8.8–16.4) 2.75 (1.96–3.84) 595 16 (2.7) 36 (6.1) 52 (8.7) 1.5 (−1.6–4.6) 1.21 (0.82–1.79) 567 41 (7.2)
 Underscreened 802 135 (16.8) 78 (9.7) 213 (26.6) 12.3 (8.4–16.2) 1.86 (1.52–2.28) 842 71 (8.4) 97 (11.5) 168 (19.9) 5.7 (2.1–9.3) 1.4 (1.13–1.73) 842 120 (14.3)
 Regularly screened 1859 419 (22.5) 490 (26.4) 909 (48.9) 13.2 (10.0–16.3) 1.37 (1.27–1.48) 1827 183 (10.0) 606 (33.2) 789 (43.2) 7.5 (4.3–10.6) 1.21 (1.12–1.31) 1853 662 (35.7)
  1. Participation rate is calculated as having a self-sample or a cervical cytology sample within 180 days after the second reminder. N: Number of randomized women. n: Number of participants in the group
  2. %: Row percentages. aTotal number of returned self-samples and cervical cytology samples. bSee classification of screening history for definitions
  3. Abbreviations:
  4. PD1: Participation difference in the total participation in the directly mailed group compared to the total participation in the control group
  5. RR1: Total participation in the directly mailed group compared to the total participation in the control group
  6. PD2: Participation difference in the total participation in the opt-in group compared to the total participation in the control group
  7. RR2: Total participation in the opt-in group compared to the total participation in the control group
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