Use of systemic treatments In US cities, 1980 and 1986.
| Classification | 1980 Number reporting | Response % yes | 1986 Number reporting | Response % yes |
|---|---|---|---|---|
| Total all cities | 1114 | 22 | 804 | 22 |
| Population group | ||||
| Over 1,000,000 | 5 | 60 | 2 | 50 |
| 500,000 | 11 | 45 | 9 | 33 |
| 250,000 | 26 | 31 | 18 | 22 |
| 100,000 | 67 | 34 | 56 | 34 |
| 50,000 | 143 | 31 | 117 | 29 |
| 25,000 | 257 | 24 | 210 | 24 |
| 10,000 | 527 | 17 | 353 | 18 |
| 5,000 | 33 | 9 | 18 | 33 |
| less than 5,000 | 45 | 13 | 21 | - |
| Geographic Region Northeast | ||||
| Northeast | 266 | 17 | 161 | 14 |
| North Central | 354 | 14 | 263 | 16 |
| South | 237 | 26 | 187 | 25 |
| West | 257 | 35 | 193 | 35 |