Membership patterns of city tree managers.
| Organization | Number reporting | % of sampled cities | % of 1534 returned questionnaires | % of 716 responses to this question | % of 406 full time tree care managers |
|---|---|---|---|---|---|
| International Society of Arboriculture | 249 | 9 | 17 | 35 | 50 |
| National Recreation and Parks Association | 228 | 8 | 16 | 32 | 32 |
| Society of American Foresters | 67 | 3 | 5 | 9 | 15 |
| Society of Municipal Arborists | 54 | 2 | 4 | 8 | 11 |
| International City Managers Association | 57 | 2 | 4 | 8 | 2 |