Table 2.

Descriptions of selected language sample measures calculated with Systematic Analysis of Language Transcripts (SALT).

Language sample measure	Description
Number of total utterances	All utterances, including partial or abandoned utterances and those with unintelligible words.
Words per minute	The number of words, including those in partial utterances and excluding maze words, divided by the number of minutes in the sample length.
Number of different words	The number of different words, including those in partial utterances and excluding maze words.
Mean length of utterance (MLU) in morphemes	MLU calculated by SALT using the analysis set (complete and intelligible utterances).
Percentage of maze words	The number of maze words, including false starts, revisions, disfluency repetitions, and filler words, divided by the number of total words.
Errors and omissions	The combined number of grammatical errors and omissions.
Percent grammatical utterances	The number of grammatical utterances, those with no grammatical errors or omissions, divided by the number of total utterances.
Subordination index	The ratio of the total number of clauses (main and subordinate) to the number of C-units. Subordinate clauses included adverbial, relative, and complement clauses excluding infinitive clauses. Independent coordinate clauses were transcribed as a separate C-unit.