WASHINGTON - U.S. non-farm productivity rose at a revised 2.2% rate in the second quarter of 2012 from the initial estimate of a 1.6% increase, as output growth was revised higher and hours worked growth was revised lower in the quarter, data released by the Bureau of Labor Statistics Wednesday showed.

As a result of the acceleration in productivity growth, unit labor costs were revised down to a 1.5% growth rate in the second quarter from the preliminary estimate of a 1.7% increase. However, unit labor costs were revised up to a 6.4% increase in the first quarter from the 5.6% jump previously reported. The index levels in both quarters were revised higher.

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