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Table 1 Per-protocol and intention-to-treat cecal intubation rates by intervention

From: Effect of a proprietary intraluminal stiffening wire device on cecal intubation time and rate with used colonoscopes; a randomized, controlled trial

  Intervention
  Unaided colonoscope (A) Standard wire (B) Firm wire (C)
Number 37 38 37
Per-protocol Cecal intubation rate (30) 81.1% (CI, 67.8 – 94.3%) (27) 71.1% (CI, 55.9 – 86.2%) *(26/35) 74.3% (CI, 59.1 – 90%)
Intention-to-treat Cecal intubation rate (36) 97.3% (CI, 91.8 – 100%) (35) 92.1% (CI, 83.1 – 100%) (31) 83.8% (CI, 71.3 – 96.2%)
  1. *Two cases in this group are excluded from the per-protocol analysis as failure occurred before the assigned intervention could be introduced.
  2. Chi-squared test of difference between per-protocol A and B cecal intubation rate, P = 0.31.
  3. Chi-squared test of difference between per-protocol A and C cecal intubation rate, P = 0.49.
  4. Exact McNemar’s test of difference between intention-to-treat and per-protocol cecal intubation rate under intervention A, P = 0.0313.