Please select the eligibility criteria that correspond to the clinical trial below.
Title: Tai Chi After Pulmonary Rehabilitation in Patients With COPD: A Randomized Trial
Brief Summary: The main purpose of this study is to determine the feasibility and effects of a 6-month tai chi exercise program as compared to a 6-month group walking program and standard care for patients with COPD that have recently completed a pulmonary rehabilitation program.


Options:
A: Inclusion Criteria:

* COPD patient.
* Aged between 55 and 85 years.
* Degree of severity II, III, or IV of the Global Initiative for Chronic Obstructive Lung Disease (GOLD) scale.
* Stable clinical situation (no exacerbations in the last 6 weeks).

Exclusion Criteria:

* Unstable cardiovascular disease or muscular, osteoarticular, auditory, visual, or central or peripheral nervous system impairment that prevents the performance of the rehabilitation program or evaluation tests.
* Cognitive impairment that makes it difficult to understand the education program and manage the HappyAir system
B: Inclusion Criteria:

1. COPD defined as FEV1 (Forced expiratory volume in 1 second)/FVC (Forced vital capacity) \<0.70 or chest CT evidence of emphysema
2. Age \> 40 years
3. Any severity of COPD as defined by GOLD (Global Obstructive Lung Disease) stages 1, 2,3, or 4
4. Completion of standard pulmonary rehabilitation of at least 8 weeks duration within 24 weeks prior to study entry\* \*Defined as attending 65% of the program's sessions with a minimum of 10 sessions

Exclusion Criteria:

1. COPD exacerbation requiring steroids, antibiotics, ED visit or hospitalization within the past 2 weeks unless physician deems subject at baseline
2. Hypoxemia on walk test (O2 sat \< 85% on oxygen)
3. Inability to ambulate due to vascular or other neuromuscular conditions that would preclude a walk test
4. Clinical signs of unstable cardiovascular disease (ie. chest pain on walk test)
5. Severe cognitive dysfunction (documented Mini-Mental Status Exam ≤ 24)
6. Non-English speaking
7. Current regular practice of tai chi
8. Current diagnosis of lung cancer or treated for lung cancer within the past 5 years
9. Unstable/untreated mental health issue that precludes informed consent or otherwise affects ability to participate in the intervention
C: Inclusion Criteria:

* Moderate to severe COPD (FEV1/FVC \<70% and FEV1%\<80%)
* Ability to speak, read and write English
* Age 40 or older
* Willingness to complete a 6 month program

Exclusion Criteria:

* Illnesses such as bronchiectasis, active malignancies or other end stage diseases
* Plans to continue in a maintenance program after rehabilitation.
D: Inclusion Criteria:

* COPD Patients willing and able to sign informed consent for use of their pseudonymized clinical data within the scope of the present interventional trial
* COPD patients who have completed an in-hospital pulmonary rehabilitation program with an average duration of 2-3 weeks.
* Diagnosis of COPD, defined as forced expiratory volume in 1s/forced vital capacity (FEV1/FVC) \<70% predicted, FEV1\<80 % predicted after bronchodilation, with or without chronic symptoms (cough, sputum production) corresponding to a GOLD stage II-IV
* Completion of the screening period and fulfilling of the randomization criteria as defined by the protocol
* Ability to use a smartphone and smartphone-apps
* Willingness to wear an activity tracker during study period of 6 months
* Patients ≥40 years of age.
* Knowledge of German language to understand study material, assessments and contents of the COPD-App

Exclusion Criteria:

* The Patient is not able to conduct the exercise training program due to physical, cognitive or safety reasons, as judged by investigator; e.g., lower limb joint surgery within preceding 3 months, unstable cardiac disease, predominant neurological limitations, planned surgical or other interventions disturbing the study intervention.
* Significant psychiatric disorders, legal incapacity or limited legal capacity.
* Patients participation in another clinical trial with an investigational medication within 30 days prior to study entry.
* Patients already using the KAIA COPD App

Answer: B