NEW YORK (TheStreet) - Which health care stocks are the best buys for 2015?

The S&P 500 Health Care Sector Index is up 24% over the past year compared to the broader S&P 500 index, which is up 11% in the same time period.

TheStreet analyzed which mid-cap health care stocks present the best opportunity for investors looking for exposure to the sector.

TheStreet Ratings, TheStreet's proprietary stock rating tool, projects a stock's total return potential over a 12-month period including both price appreciation and dividends. Based on 30 major data points, TheStreet Ratings uses a quantitative approach to rating stocks. The model is both objective, using elements such as volatility of past operating revenues, financial strength, and company cash flows, and subjective, including expected equities market returns, future interest rates, implied industry outlook, and forecasted company earnings.

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11 Best Mid-Cap Health Care Stocks Worth Targeting for 2015