Level of Support from Friends and Family

A question about an individual's level of social activity.

Opinion of respected authorities based on clinical experience, descriptive studies, or reports of expert committees.

Opinions of respected authorities based on clinical experience, consensus statements from expert committees, or authoritative reviews.

Prospective, nonrandomized, controlled trials; prospective cohort studies; prospective case series; and cross-sectional studies.

Prospective, randomized, controlled trials and meta-analyses of prospective, randomized, controlled trials.