\begin{table}[htbp]
\centering\footnotesize
\caption{Placebo: sale months permuted within municipality (three replications); estimated deviations should be flat}\label{tab:placebo}
\begin{threeparttable}

\begin{tabular}{lrrrrr}
\toprule
Class / level & Cells & s.d. of deviation ($\times$100) & Median max $|$12-m change$|$ ($\times$100) & \% of 12-m changes outside 95\\% band & Median $\tau$ ($\times$100) \\
\midrule
condo / mrc & 240 & 0.22 & 0.32 & 0.5 & 0.35 \\
condo / municipality & 735 & 0.17 & 0.26 & 0.4 & 0.47 \\
condo / region & 48 & 0.05 & 0.07 & 0.0 & 0.10 \\
house / mrc & 306 & 0.25 & 0.35 & 1.6 & 0.22 \\
house / municipality & 3327 & 1.58 & 2.39 & 0.7 & 1.40 \\
house / region & 51 & 0.84 & 2.70 & 11.8 & 0.75 \\
plex / mrc & 303 & 0.28 & 0.33 & 0.2 & 0.35 \\
plex / municipality & 2901 & 0.95 & 1.32 & 0.1 & 1.63 \\
plex / region & 51 & 0.09 & 0.15 & 0.3 & 0.14 \\
\bottomrule
\end{tabular}

\end{threeparttable}
\end{table}