Please assess the completion status of the following clinical trial:

Trial Title: The Role of Oxidative Stress in the Cardiovascular Consequences of Sleep Apnea

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: CASE_CONTROL
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* Completed sleep study - Older than 18~Exclusion Criteria:~* Hypertension~* Diabetes~* coronary disease~* Peripheral vascular disease~* High cholesterol~* Smoking~* Pregnancy~* Use of erectile dysfunction medications or supplements

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- Control group: healthy individuals without OSA (Type: None): healthy individuals without OSA who are matched in weight and age to the participating OSA patients
- OSA group (Type: None): Patients in the OSA group receive CPAP for 12 weeks as part of their care. patients with OSA provide measures at baseline and after 12 weeks of CPAP treatment.

Based on this trial design, predict the completion outcome and termination type (if applicable).