Injury experience is studied in an underground coal mine with a random sample of 132 workers. The results of the study are tabulated below.
\[ \begin{array}{|c|c|c|c|} \hline \text{Injured} & \text{Non-injured} & \text{Total workers} \\ \hline \text{Roof-bolter operators} & 13 & 12 & 25 \\ \text{Loader operators} & 35 & 72 & 107 \\ \hline \text{Total workers} & 48 & 84 & 132 \\ \hline \end{array} \] The odds ratio of experiencing an injury by the roof-bolter operators when compared to the loader operators is \(\underline{\hspace{1cm}}\). (round off to 2 decimal places)