| Member and/or contributor | Contributor beyond membership (base member) | |
| Member/contributor to one or more institutions (net) |
86.1% | 34.2% |
| Art museum | 33.5% | 8.1% |
| Natural history/science museum | 66.3% | 11.0% |
| Performance arts (Symphony orchestra/ballet/dance company, etc) |
27.6% | 13.4% |
| Zoo/aquarium/botanical garden | 37.4% | 8.1% |
| Other cultural institution | 23.7% | 16.1% |
| PBS/NPR membership | 38.2% | |
| Member/contributor to two or more institutions (net) |
60.6% | 18.1% |
| Member/contributor to three or more institutions (net) |
38.1% | 8.6% |
Source: 2008 Ipsos Mendelsohn Natural History Subscriber Study. Indexes based on 2008 Mendelsohn Affluent Survey