Smith JA, et al. - A prospective cohort study with 12 months of follow-up was conducted to explore quantify associations between low back pain (LBP) symptoms, physical activity, and psychosocial characteristics in young adults and distinguish sub-classes of young adults with distinct pain trajectories. Researchers enrolled a total of 120 adults (age 20.8±2.6 years, 99 women) who participated in this study. Latent class analysis was used to distinguish sub-classes based on pain trajectories over time and predictors of class membership at baseline were evaluated. It has been reported that most young adults with LBP had symptoms that improved over time. The results demonstrate that the levels of fear avoidance and pain interference may help to identify individuals at risk of persistent pain early in the lifespan.