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 |
| --- | --- | --- | --- | --- | --- |
| Ohio 2 | William E. Hess | Republican | 1938.0 | Re-elected | William E. Hess (R) 56.0% J. Harry Moore (D) 44.0% |
| Ohio 6 | Edward O. McCowen | Republican | 1942.0 | Re-elected | Edward O. McCowen (R) 51.8% John W. Bush (D) 48.2% |
| Ohio 9 | Homer A. Ramey | Republican | 1942.0 | Re-elected | Homer A. Ramey (R) 51.6% John F. Hunter (D) 48.4% |
| Ohio 12 | John M. Vorys | Republican | 1938.0 | Re-elected | John M. Vorys (R) 54.3% Forrest F. Smith (D) 45.7% |
| Ohio 13 | Alvin F. Weichel | Republican | 1942.0 | Re-elected | Alvin F. Weichel (R) Unopposed |
| Ohio 14 | Edmund Rowe | Republican | 1942.0 | Lost re-election Democratic gain | Walter B. Huber (D) 50.6% Edmund Rowe (R) 49.4% |
| Ohio 18 | Earl R. Lewis | Republican | 1942.0 | Re-elected | Earl R. Lewis (R) 51.1% Ross Michener (D) 48.9% |
| Ohio 21 | Robert Crosser | Democratic | 1922.0 | Re-elected | Robert Crosser (D) 77.7% Harry C. Gahn (R) 22.3% |
Question:
What is the first electedfor district ohio 18
Answer:
1942.0