PORTLAND — The Unum Group, based in Chattanooga, Tenn., reported today a net income of $229.8 million or 75 cents per share for the second quarter of 2011, compared to its net income of $209.7 million or 63 cents per share for the same quarter last year.

In a statement released today to its employees, Unum, which has offices in Maine, said the company continues to produce solid results. Those results included a 9 percent growth in sales.

Company officials said that while the economy and current employment trends continue to challenge growth, Unum’s disciplined approach to business is serving the company well.

“The second quarter was another good quarter for Unum, with our solid operating and investment results being enhanced by our share repurchase program,” Thomas R. Watjen, president and chief executive officer, said in a statement. “Despite the continued soft economic and employment picture, our disciplined approach to our business is continuing to serve us well and positions us to capitalize on market opportunities.”