Table 1.

Operational definitions for feasibility categories

Feasibility category	Operational definition
Non-compliant Examiner/Transcriber Report	Examiners and transcribers were instructed to note behavioral observations of noncompliance, defined as explicit refusal to complete the task, no response, or repeated off-task behavior. (Note: for the narration task, transcribers also classified samples in which the participant produced a task-related C-unit on 11 pages or fewer of the 16-page spreads presented).
Total Sample Utterance Length	Samples in which the participant produced < 50 C-units in conversation or < 25 C-units in narration. (Note: this variable includes utterances that are partially or completely unintelligible, which is the sample used when calculating intelligibility).
Analysis Set Utterance Length	Samples in which the participant produced < 50 C-units in conversation or < 25 C-units in narration. (Note: this variable includes only utterances that are complete and intelligible, which is the sample used when calculating lexical diversity, syntax, and dysfluency).
Sample duration	Conversation samples that were at least 9.5 min in duration or narration samples in which the participant produced at least one task-related C-unit for each of the 16-page spreads presented.