# Is the -OCH3 group bulky?

Our teacher told us that $$\ce{OCH3}$$ is a less bulky group when compared to other bulky groups like $$\ce{CH3}$$, $$\ce{NO2}$$ etc. Is this true? If yes, why?

$$\begin{array}{lc} \hline \text{Substituent} & \text{A-Value}/\pu{kcal mol-1} \\ \hline \ce{-OCH3} & 0.6 \\ \ce{-NO2} & 1.1 \\ \ce{-CH3} & 1.7 \\ \hline \end{array}$$