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Table 7 Sensitivity analyses excluding patients without mode preference

From: Improving participation rates by providing choice of participation mode: two randomized controlled trials

Invitation formats No choice Choice     
TRIAL 1 Interview (n = 198) Interview or questionnaire (n = 113) X 2 df p RR (95%CI)
Participation rate 130 (66%) 72 (64%) 0.12 1 0.73 0.95 (0.69 - 1.29)
Conditional participation rate 130 (90%) 72 (77%) 7.43 1 <.01 0.44 (0.24 - 0.81)
Willing to participate 145 (73%) 94 (83%) 4.006 1 <.05 1.59 (1.00 - 2.55)
  No choice Choice     
TRIAL 2 Questionnaire (n = 294) Interview or questionnaire (n = 189) X 2 df p RR (95%CI)
Participation rate 134 (46%) 110 (58%) 7.33 1 <.01 1.30 (1.07 - 1.59)
Conditional participation rate 134 (53%) 110 (69%) 10.63 1 <.01 1.53 (1.17 - 1.99)
Willing to participate 253 (86%) 159 (84%) 0.34 1 0.56 0.88 (0.57 - 1.36)