METHODS: This was a multicenter, prospective, single-blinded, randomized controlled noninferiority trial. The noninferiority margin was set at 15%. One hundred sixty-seven patients were recruited and randomized to either the LREF group or the standard diet (SD) group using a 3L PEG preparation regimen.
RESULTS: The LREF group results in comparable satisfactory preparation rating to the standard diet group with a mean BPPS score of 6.87 (SD 1.59) versus 7.14 (SD 1.54) (95% CI[-0.86; 0.32] and p = 0.367). The mean difference (MD) of the BBPS total score between the two groups was -0.27 (95% CI [-0.764 and 0.224]). Equivalence were demonstrated using the two one-sided test (alpha = 5%) with the lower t-value of 2.682 (p = 0.0042) and the upper t-value of -4.493 (p