Psychological services utilization: relationship to severity of behaviour problems in intellectual disability services.

The authors looked at how often adults with intellectual disability (ID) see a psychologist. They used service records to count contacts and grouped clients by how severe their behavior problems were.

They wanted to know if the people with the toughest behaviors also used the most psychology time.

The top 20% of behavior severity grabbed most of the psychology visits. One in four of these high-severity clients saw psychology weekly or more. Meanwhile, more than a third of all clients had no psychology contact at all.

In short, severe behavior drives service demand, but many still get zero psychology time.

Smith et al. (1997) saw the same ID service system one year earlier. They found milder ID and living alone predicted more psychiatric visits, not severity. The two studies look opposite, but they measure different things: G counted any psychiatric contact, while Jacobson (1998) counted psychology contacts tied to behavior level. Together they show both client traits and behavior shape service use.

Mason (2007) later asked clinicians why they withhold therapy from ID clients. The main reasons were low clinician confidence and high client disability, echoing W’s finding that severe cases already soak up most slots.

Across the globe, Dagnan et al. (2005) in Taiwan and Chiang et al. (2013) also found that people with ID plus behavior or psychiatric needs use far more outpatient visits. The pattern repeats: a small high-need slice eats the lion’s share of care.

If you supervise ID services, expect your calendar to fill with the same high-severity clients. Reserve standing weekly slots for them and build a wait-list triage that moves lower-severity cases to group training or brief check-ins. This keeps the heavy users served while the zero-contact third finally get some support.