highly significantp < 0.001
A highly significant model was obtained (Chi-square = 16.288; p < 0.001) in which only the variable initial concentrations of the two gases remained, for CH 4 (Exp B = 0.974, 95%CI 0.958–0.991; p = 0.020) and for H 2 (Exp B = 0.986, 95%CI 0.974–0.998; p = 0.010), indicating that the probability of treatment success is lower with increasing concentrations and much higher for CH 4 -SIBO ( Figure 2 a) than for H 2 -SIBO ( Figure 2 b). 4.