Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Wisconsin 1 | Mark Neumann | Republican | 1994.0 | Re-elected | Mark Neumann (R) 51% Lydia Spottswood (D) 49% |
| Wisconsin 3 | Steve Gunderson | Republican | 1980.0 | Retired Democratic gain | Ron Kind (D) 52% James Harsdorf (R) 48% |
| Wisconsin 4 | Jerry Kleczka | Democratic | 1984.0 | Re-elected | Jerry Kleczka (D) 58% Thomas G. Reynolds (R) 42% |
| Wisconsin 7 | Dave Obey | Democratic | 1969.0 | Re-elected | Dave Obey (D) 57% Scott West (R) 43% |
| Wisconsin 8 | Toby Roth | Republican | 1978.0 | Retired Democratic gain | Jay W. Johnson (D) 52% David Prosser, Jr. (R) 48% |
Question:
How many districts had results related to incumbent Toby Roth?
Answer:
1.0