For a study regarding mean cadence, two-way ANOVA was used. The two factors were walking device (none, standard walker, rolling walker) and dual task (being required to respond vocally to a signal or no dual task required). Results of two-way ANOVA showed that there was no evidence of interaction between the factors. However, according to the article, "the ANOVA conducted on the cadence data revealed a main effect of walking device." When the hypothesis regarding no difference in mean cadence according to which, if any, walking device was used, the sample F was 30.94, with d. f.N = 2 and d. f.D = 18. Further, the P-value for the result was reported to be less than 0.05. Required:

What is the conclusion regarding any difference in mean cadence according to the factor "walking device used"?