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We perform a meta-study of recently published Redshift Space Distortion (RSD)measurements of the cosmological growth rate, f(z) \sigma_8(z). We analyse thelatest results from the 6dFGS, BOSS, LRG, WiggleZ and VIPERS galaxy redshiftsurveys, and compare the measurements to expectations from Planck. In thisLetter we point out that the RSD measurements are consistently lower than thevalues expected from Planck, and the relative scatter between the RSDmeasurements is lower than expected. A full resolution of this issue mayrequire a more robust treatment of non-linear effects in RSD models, althoughthe trend for a low \sigma_8 agrees with recent constraints on \sigma_8 and\Omega_m from Sunyaev-Zeldovich cluster counts identified in Planck.

A Lower Growth Rate from Recent Redshift Space Distortion Measurements than Expected from Planck