Correlation between the results of the agar well diffusion assay
and the broth co-culture for inhibition of C. difficile was good
(r ¼ 0.75) and significant (p ¼ 0.0004). Correlation between the
results of the agar well diffusion assay and the broth co-culture for
inhibition of C. perfringens was moderate (r ¼ 0.57) and significant
(p ¼ 0.0179). Overall agreement between the two tests was also
good (r ¼ 0.71) and significant (p < 0.00001).