Classification accuracy (%) on the combined dataset (i.e., adolescents and young adults) with kineme histograms. The effect of four factors is shown: Histogram type (count vs. magnitude), treatment of scales (separated or collapsed), letters used (singletons vs. all letters) and usage of speech detection (speech- and listening-time kinemes in different histograms combined, speech-time kinemes only, listening-time kinemes only, and no usage of speech separation). Bold, italic and underlined texts respectively denote the first, second, and third best result. †Spe: Speaking, Lis: Listening, Non-sep: Non-separated speech.