Table 2

Uptake of screening by trial arm

First offer: HPV self-sampling
Arm A
First offer: Pap test
Arm B
Number of potentially eligible womenWomen screenedNumber of potentially eligible womenWomen screened
Type of analysis, primary outcomeNPer cent‡NPer cent‡Per cent difference between arms (95% CI)*p Value†
ITT analysis
Uptake in response to initial offer of screening§4045420.0 (13.4)5983514.3 (5.9)5.7 (−11.6 to 34.0)0.628
Cumulative uptake§4045520.6 (13.6)5984116.0 (6.9)4.6 (−13.9 to 32.3)0.694
Per protocol analysis
Uptake in response to initial offer of screening§4046322.9 (15.6)4302610.6 (6.0)12.3 (2.4 to 46.6)0.305
Cumulative uptake§4046322.9 (15.6)4303314.1 (7.7)8.8 (−4.7 to 39.6)0.448
  • *Percentage point difference between community-averaged uptake within each arm, CI was calculated by the bootstrap method.36

  • †p Value from permutation test.

  • ‡The community-averaged uptake within each arm; the mean uptake within each arm are in in parentheses.

  • §Intracluster correlation coefficients (ICC) were calculated to be ∼0.01 for screening outcomes.