Which ASAM level typically involves less than 9 hours of service per week for adults?

The correct choice is associated with the ASAM (American Society of Addiction Medicine) criteria for determining the level of care for individuals experiencing substance use disorders. Specifically, the level that typically involves less than 9 hours of service per week for adults is Level 1, which is often referred to as Outpatient Services.

Level 1 is designed for individuals who may require some support but do not need intensive treatment. The services provided at this level often involve counseling, education, and support, allowing individuals to maintain their daily lives while receiving treatment. This is particularly suitable for those with a mild addiction or for those who are transitioning from higher levels of care.

In contrast, the other levels mentioned generally involve more intensive engagement. Level 2.1, for example, involves a more structured environment and typically requires more hours of service per week. Level 3.1 and Level 0.5 cater to individuals who need different degrees of residential services or early intervention, which also tend to involve more frequent and longer hours of service. Thus, Level 1's structure makes it fitting for adults needing less than 9 hours of services per week.