Final answer:
PTA work experience must be supervised by a licensed PT and obtained within a specific timeframe, with a portion required to be recent, but the exact number of years is not provided in the information given.
Step-by-step explanation:
The work experience required for a Physical Therapist Assistant (PTA) generally must be obtained within a certain period of time before the application. According to the question, the supervision during this work experience needs to be direct and immediate, and is to be conducted by a licensed PT, a PT employed by the government, or an out-of-state licensed PT. In terms of timelines, some programs or states may have specific requirements regarding the number of years within which the experience needs to be obtained and might specify a fraction or a portion of that experience to be even more recent to the time of application.
An example from the job ads mentioned could represent these typical requirements; however, the exact numbers of years within which work experience should be obtained, and the portion required to be most recent are omitted in the provided information. The complete requirements would likely include detailed criteria for both the quantity and the recency of pertinent work experience to ensure the PTA's knowledge and skills are current and comprehensive.