## 2 GSHTS Dataset Description and Processing
### The LI-CBT Treatment Competency Scale  
There are 51 sessions in the dataset that has associated mood outcome scores: the Patient Health Questionnaire (PHQ-9), the Generalised Anxiety Disorder (GAD-7) and the LI-CBT treatment competency scale. The PHQ-9 consists of nine depression questions, each scored from zero to three, summing up to 27 points. In addition, GAD-7 is an assessment measure that can be used to detect generalised anxiety disorder. It contains seven questions, each scored from zero to three, with a total score of 21. The LI-CBT treatment competency scale is a scaled measure used to rate practitioners' skillfulness during the treatment of patients with mild-moderate depression and anxiety disorders. It consists of six items that enable treatment session raters to examine a range of competencies [10]:  
* focusing the session;
* continued engagement competencies;
* interpersonal competencies;
* information gathering: specific to change;
* within session self-help change method;
* planning and shared decision making competencies. Each item in the scaled measure is described in a documented manual for the raters or clinical supervisors to ensure an adequate rating based on each specified competency. \begin{table}
\begin{tabular}{l r r r r} \hline \hline
**Patient Demographics** & **Total (All Sessions)** & **Average** & **Min** & **Max** \\ \hline Number of patients & 54 & - & - & - \\ Female & 39\% & - & - & - \\ Age & - & 37 & 16 & 74 \\ In-person sessions & 34\% & - & - & - \\ \hline Session information & & & & \\ Length (mins) & 1634 & 30 & 20 & 52 \\ Number of words & 264,069 & 4890 & 354 & 5462 \\ Number of segments & 9271 & 172 & 35 & 194 \\ Time talking per session (mins) & & & & \\ Patient & 644 & 12 & 3 & 22 \\ Practitioner & 927 & 18 & 8 & 28 \\ Words spoken per session & & & & \\ Patient & 104,981 & 1944 & 354 & 3997 \\ Practitioner & 159,088 & 2946 & 1351 & 5462 \\ Number of segments per session (N) & & & & \\ Patient & 4526 & 84 & 35 & 193 \\ Practitioner & 4745 & 88 & 36 & 194 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Patient demographics and therapy session information for the GSHTS dataset. Figure 1: Dataset details per session for each speaker (PAT: patient, INT: practitioner) (**Left**) Number of words. (**Right**) Total seconds. The competencies are rated on a scale from 0 to 6 based on a competence level, for each competency item. The total score may range from zero to 36 and the psychometric reliability and validity of the measure have been established. The focusing the session competency item concentrates on rating the practitioner's ability to develop and subsequently adhere to an agenda for the treatment session. The continued engagement competencies item assesses the continuous engagement of the patient in the process of change in a collaborative manner. The practitioner should guarantee that the patient's progress is acknowledged by reflection and summaries. The interpersonal competencies item depends on ratings of the practitioner's ability to develop interpersonal skills for maintaining therapeutic relationships with patients and for providing an empathetic and containing space for patients to proceed with their treatment. The information gathering: specific to change item estimates the practitioner's competence in gathering information from the patient concerning the changes made and improvements achieved over the course of treatment in a positive and considerate manner. The within session self-help change method item evaluates the practitioner's ability to select the appropriate treatment method for the patient based on their problem and following established treatment principles. The scale item planning and shared decision making competencies determines the practitioner's competence in planning 'homework' actions related to the patient's needs, session content and stage of treatment, taking into consideration the appropriate evidence base.