user: Question: What were the matches where the teams finished in the First Group Stage, in 1998?
Columns: ['Year', 'Result', 'Matches', 'Wins', 'Draws', 'Losses']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1991', 'Did Not Qualify', 'Did Not Qualify', 'Did Not Qualify', 'Did Not Qualify', 'Did Not Qualify']
SQL:

assistant: SELECT "Matches" FROM "Table" WHERE "Result" = 'First Group Stage' AND "Year" = '1998';