Regarding the call to action, much more research in this area is needed, particularly because supporting the absence of distinct trajectory classes requires a lot of work. Our findings are preliminary rather than definitive and subsequent research using high-powered longitudinal studies is needed to replicate our results, expand our range of correlates, generalize our findings beyond our sample, and rule out various alternatives. Furthermore, the possibility remains that very rare taxa (<1% prevalence) may remain hidden within the broader distribution, eluding attempts to uncover them using trajectory analytic techniques.
