CREATE TABLE table_16891 ("Name of ground" TEXT, "Location" TEXT, "First-class span" TEXT, "Worcs f-c matches" FLOAT, "List A span" TEXT, "Worcs LA matches" FLOAT)

There were 68 worcs f-c matches played on Chester Road North Ground.
SELECT "Worcs f-c matches" FROM table_16891 WHERE "Name of ground" = 'Chester Road North Ground'
SELECT "Worcs f-c matches" FROM "table_16891" WHERE "Name of ground" = 'Chester Road North Ground'