Sportswear giant Reebok International Ltd on Thursday posted a 10 per cent fall in first quarter net income to $37 million compared to the $41m recorded in the year-ago period. The company said net sales for the quarter to March 31, 2002 fell to $736m from $770m. Worldwide sales for the Reebok brand were flat at $612m, while US sales rose to $319m and international sales slipped to $293m.