The first is that these data come from individuals receiving state developmental disabilities services, which may reflect a more impaired population than if one were to randomly sample from all individuals with ASD, DS or ID.

The second limitation of this study was the fact that all data were taken at a single time point. Information about individuals shifting from paid community employment to paid facility employment across time is unknown. Therefore, caution when interpreting age trends and causal relationships.

The third limitation of the study is the nature of the variable “employment status”. This variable is a three-point ordinal variable (0 =no employment, 1=paid facility work, 2 =paid community job), which may have less statistically sound metrics than if regression analyses used a dependent variable with additional levels or a continuous variable.