More people with learning disabilities from black and minority ethnic groups had been given anti-psychotic drugs on a regular basis than in white ethnic groups - 72.6% (284 out of 391) compared with 61.8% (1682 out of 2,720) - analysis of a census has revealed.
The findings were based on survey responses from 104 (58 NHS and 46 private) provider organisations in England on behalf of 3,250 service users in September last year.
The patient group included people with learning disabilities, autistic spectrum disorder and/or behaviour that challenges.
The census revealed that of the 56.6% (1,841) of patients who had experienced an "incident", more women experienced every type of incident than men. The HSCIC said the census will be re-run in September 2014 in order to identify change and reductions in inpatient care to community care and support.
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A 61-year-old woman was taken to hospital with head injuries after the incident in Islington, north London.
Counting will begin on Saturday morning, with the result expected later in the day.
There have been a number of incidents involving heavy goods vehicles getting stuck and causing disruption in recent months.