Causal Mediation Analysis of Factors Influencing Physical Activity and Community Access Among People With Mild-to-Moderate Parkinson Disease.

Objective: To examine how known causal factors (exercise self-efficacy, balance, walking capacity) affect outcomes (moderate-intensity physical activity, community access) in people with Parkinson disease (PD): through a direct pathway, indirectly through potential mediators (nonmotor impairments), or through combined direct and mediated paths.

Design: Causal mediation analyses using baseline and three-month data from pooled treatment groups in a randomized controlled trial.

Setting: Data were collected at 2 university clinical research centers.

Two-Year Trajectory of Fall Risk in People With Parkinson Disease: A Latent Class Analysis.

Objective: To examine fall risk trajectories occurring naturally in a sample of individuals with early to middle stage Parkinson disease (PD).

Design: Latent class analysis, specifically growth mixture modeling (GMM), of longitudinal fall risk trajectories.

Setting: Assessments were conducted at 1 of 4 universities.