CREATE TABLE table_3199 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

Name the total number of districts for first elected being 1998
SELECT COUNT("District") FROM table_3199 WHERE "First elected" = '1998'
SELECT COUNT("District") FROM "table_3199" WHERE "First elected" = '1998'