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The masses of sterile neutrinos are not yet known, and depending on theorders of magnitudes, their existence may explain reactor anomalies or thespectral shape of reactor neutrino events at 1.5km-baseline detector. Here, wepresent four-neutrino analysis of the results announced by RENO and Daya Bay,which performed the definitive measurements of $\theta_{13}$ based on thedisappearance of reactor antineutrinos at km-order baselines. Our results using3+1 scheme include the exclusion curve of $\Delta m^2_{41}$ vs. $\theta_{14}$and the adjustment of $\theta_{13}$ due to correlation with $\theta_{14}$. Thevalue of $\theta_{13}$ obtained by RENO and Daya Bay with a three-neutrinooscillation analysis is included in the $1\sigma$ interval of $\theta_{13}$allowed by our four-neutrino analysis.

Four-neutrino analysis of 1.5km-baseline reactor antineutrino oscillations