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We employed published rotation periods of {\it Kepler} field stars to testwhether stars hosting planets tend to rotate more slowly than stars withoutknown planets. Spectroscopic vsini observations of nearby stars with planetshave indicated that they tend to have smaller visni values. We employ data for{\it Kepler} Objects of Interest (KOIs) from the first 16 quarters of itsoriginal mission; stellar parameters are based on the analysis of the first 17quarters. We confirm that KOI stars rotate more slowly with much greaterconfidence than we had previously found for nearby stars with planets.Furthermore, we find that stars with planets of all types rotate more slowly,not just stars with giant planets.

Parent Stars of Extrasolar Planets. XV. Host Star Rotation Revisited with {\it Kepler} Data