Please assess the completion status of the following clinical trial:

Trial Title: Physical Activity in Adults With Amputation

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

Eligibility Criteria:
Inclusion Criteria (all participants):~* Ages 18-60 years~* Able to read and speak English~* Saltin-Grimby Physical Activity Level of I or II~Inclusion Criteria (individuals with unilateral, transtibial amputations):~* Unilateral, transtibial (below-the-knee) amputation~* Currently wearing a prosthesis with use of an assistive device no greater than a cane~* Wearing prosthetic at least 8 hours per day and inside and outside the home: This criteria will help to ensure that adults are beyond the initial weaning into a prosthetic period and are prosthetic users rather than nonusers.~Inclusion Criteria (controls):~* Pain-free in the legs and low back regions~* Able to walk without an assistive device~Exclusion Criteria:~* Current infections or illnesses that would affect safe participation in the study~* Past medical history of significant cardiovascular disease (e.g. congestive heart failure or previous heart attacks), significant neurological disease (e.g. Parkinson's, Multiple Sclerosis) significant neurological event (e.g. stroke), or major lung condition (e.g. Chronic obstructive pulmonary disease, emphysema)~* Uncontrolled high blood pressure~* Uncontrolled Diabetes Mellitus

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 60 Years
- Healthy Volunteers: t

Study Arms:
- Unilateral Transtibial Amputation (Type: None): Individuals with a unilateral, transtibial amputation.
- Controls (Type: None): Healthy adults without a lower-limb amputation who have been matched to participants in the Unilateral Transtibial Amputation group based on age, sex, and body mass index.

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