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Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model. NEW YORK ( TheStreet) -- Aetna (NYSE: AET) hit a new 52-week high Tuesday as it is currently trading at $55.64, above its previous 52-week high of $55.62 with 1.7 million shares traded as of 1:47 p.m. ET. Average volume has been 3.3 million shares over the past 30 days. Aetna has a market cap of $17.71 billion and is part of the health care sector and health services industry. Shares are up 17.7% year to date as of the close of trading on Monday. Aetna Inc. operates as a diversified health care benefits company in the United States. The company operates in three segments: Health Care, Group Insurance, and Large Case Pensions. The company has a P/E ratio of 11.2, below the S&P 500 P/E ratio of 17.7.