https://www.theguardian.com/culture-professionals-network/2015/nov/11/accessibility-in-theatre-infographic
Data analysis company Purple Seven have created an infographic to illustrate how disabled people are increasing their engagement with the arts by using a free email survey tool for theatre companies and venues they work with to gather feedback on shows, as well as demographics and disability info.

See this research in full by clicking the above link to The Guardian.