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 |
| --- | --- | --- | --- | --- | --- |
| Kentucky 1 | Noble Jones Gregory | Democratic | 1936 | Re-elected | Noble Jones Gregory (D) Unopposed |
| Kentucky 2 | John A. Whitaker | Democratic | April 17, 1948 (Special) | Re-elected | John A. Whitaker (D) 63.4% Mallam Lake (R) 36.6% |
| Kentucky 4 | Frank Chelf | Democratic | 1944 | Re-elected | Frank Chelf (D) 59.4% Stanley Jaggers (R) 40.6% |
| Kentucky 5 | Brent Spence | Democratic | 1930 | Re-elected | Brent Spence (D) 66.2% George T. Smith (R) 33.8% |
| Kentucky 7 | W. Howes Meade | Republican | 1946 | Lost re-election Democratic gain | Carl D. Perkins (D) 60.5% W. Howes Meade (R) 39.5% |
Question:
How many times was incumbent Noble Jones Gregory first elected?
Answer:
1.0