CREATE TABLE table_73993 ("Edition" TEXT, "Year" FLOAT, "Host city" TEXT, "Host country" TEXT, "Date" TEXT, "No. of athletes" TEXT, "Nations" FLOAT)

What was the number of athletes for the 7th edition?
SELECT "No. of athletes" FROM table_73993 WHERE "Edition" = '7th'
SELECT "No. of athletes" FROM "table_73993" WHERE "Edition" = '7th'