user: Question: What is the turnout with 15 candidates and more than 377591 valid poll?
Columns: ['Constituency', 'Electorate', 'Turnout', 'Spoilt', 'Valid Poll', 'Quota', 'Seats', 'Candidates']
Types: ['text', 'real', 'text', 'text', 'real', 'text', 'real', 'real']
Sample row: ['Connacht–Ulster', 464661.0, '322,664 (69.4%)', '10,362 (3.2%)', 312302.0, '78,076', 3.0, 13.0]
SQL:

assistant: SELECT "Turnout" FROM "Table" WHERE "Candidates" = 15.0 AND "Valid Poll" > 377591.0;