Table 1.

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

	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%)

*Two cases in this group are excluded from the per-protocol analysis as failure occurred before the assigned intervention could be introduced.

Chi-squared test of difference between per-protocol A and B cecal intubation rate, P = 0.31.

Chi-squared test of difference between per-protocol A and C cecal intubation rate, P = 0.49.

Exact McNemar’s test of difference between intention-to-treat and per-protocol cecal intubation rate under intervention A, P = 0.0313.