Ten-Year Latent Trajectories of Global Function and Their Associations with Social Relationship Factors: A Traumatic Brain Injury Model Systems Study.

Latent class growth analysis identified trajectory classes, with the optimal model selected based on fit indices.

Multinomial logistic regression examined associations between social relationship factors and trajectory membership, adjusting for covariates ( α = 0.05).

Over 10 years post-injury, these associations strengthened, particularly for intimate relationships and having a close friend to confide in (ORs: 1.05-1.28, p < 0.05), followed by living with a partner (ORs: 1.07-1.16), weekly social engagement (ORs: 0.87-0.95), and total subscale score (ORs: 0.95-0.98; all p < 0.05).