Athletic apparel and footwear producer Reebok International Ltd on Thursday reported a nine per cent year-on-year rise in first quarter net income as higher clothing sales boosted overall profit margins. The Massachusetts-based company said in a statement it enjoyed net income for the quarter to March 31 of $40.8 million, or 63 cents per share, versus $37.1m, or 51 cents per share, in the year-ago period.