Patients who were assigned to receive usual care were instructed to continue up with their regular medical appointments and their usual check-ups/reviews and if they had any questions, to call the health coach.

In the intervention group, a self-management program was implemented.

A "training book" was given to this group, which was created for the study. The implementation process followed a five-step approach including sessions once a month for five consecutive months with a coach and follow-up phone calls after the end of the sessions.To inspire and engage patients, the sessions included a variety of educational techniques, including knowledge transfer, discussion, hands-on training, and homework. Additionally, coaches received training in motivational interviewing methods. The self-management program and all the process of data collection is described in detail on the supplementary file.

Assessment of the potential effect of self-management intervention on Quality of life using Short-Form Health survey (SF-12) questionnaire. The SF-12 is one of the most widely used instruments for assessing self-reported health-related quality of life. Scores range from 0 to 100, with higher scores indicating better physical and mental health functioning

Assessment of the potential effect of self-management intervention on functional status using COPD Clinical Questionnaire (CCQ) for clinically evaluating COPD.The Clinical COPD Questionnaire (CCQ) measures health status and can be used to assess health-related quality of life (HRQL). The overall CCQ consists of 10 items that are scored from 0 to 6. The final score is the sum of all items divided by 10. Higher scores indicate a worse health status.

Assessment of the potential effect of self-management intervention on depression using Beck Depression Inventory, 2nd edition (BDI).The Beck Depression Inventory (BDI) is a 21-item self-reporting questionnaire for evaluating the severity of depression in normal and psychiatric populations.Scores range from zero to 60. Higher total scores indicate more severe depressive symptoms.

Assessment of the potential effect of self-management intervention on anxiety using Beck Anxiety Inventory (BAI). The BAI is a rating scale used to evaluate the severity of anxiety symptoms. The total score ranges from 0 to 63, with higher scores indicating more severe anxiety symptoms.

Assessment of the potential effect of self-management intervention on patient education, using Health Education Impact Questionnaire (HeiQ), for evaluating the training intervention. Responses to 40 items are marked on a 4-point Likert scale, using the endpoints "strongly disagree/strongly agree". A higher score indicates stronger skills in the management of the chronic condition, except in the emotional distress dimension, which is negatively scored.