Table 2.

Feature lists.

Feature	Description
Silence-based features
Total silence	Total length of silence during the test.
Total voiced	Total length of voiced during the test.
Number of silence segments	Total number of silence segments.
Number of voice segments	Total number of voice segments.
Average silence between word	Total silence divided by the number of silence segments.
Q1 Silence	Total silence in the first 30 s of the audio file.
Q2 Silence	Total silence in the last 30 s of the audio file.
Silence before first word	Silence length before the participant speaks the first word.
Different silence between Q1 and Q2	Total silence in the first 30 s minus the last 30 s.
Similarity-based features
Orthographic similarity	Average orthographic similarity value of all words.
Levenshtein distance	Average Levenshtein distance ratio of all words.
Semantic similarity	Average semantic similarity value of all words.
Cluster features
Phonemic clustering	Group of words by phonemic categories.
Switching	Total number of the transition between clusters.