NAPERVILLE, Ill. — Charges related to store closures in the United States caused OfficeMax's first quarter net income to drop from $4.9 million, or 6 cents per diluted share, compared with $11.4 million, or 12 cents per diluted share, in the first quarter of 2011. Adjusting for these charges, net income for the quarter was $20.3 million, or 23 cents per diluted share, compared with $11.4 million, or 13 cents per diluted share for the same period last year.