(Bloomberg) -- The latest reason to worry about the stock market is quite the doozy: Earnings growth has been too strong. While in isolation those rates are healthy from a historical standpoint, the market often has been less supportive when earnings growth decelerates from elevated levels. That compares with a median 14% return and a hit rate of 83.3% when EPS growth is above trend and accelerating. And the growth rate is not the only standout statistic for the second quarter reporting season. S&P 500 Index profits are also heading toward one of their largest beats on record versus analysts' estimates, according to Citadel Securities.