How do I do an if with value in mustache.js?

I have the following code:

    <script id="tplPLDSemanal" type="text/template">
       {{#.}}
          <tr>  
              <td width="20%">{{Peso}}</td>                                                                                                                             
              <td width="20%">{{SECO}}</td>
              <td width="20%">{{Sul}}</td>
              <td width="20%">{{Nordeste}}</td>
              <td width="20%">{{Norte}}</td>
          </tr>
       {{/.}}
   </script>

and I would like to do something like the following, but it does not work

if ({{Peso}} == 2) 
   <td width="20%">Leve</td>
else if({{Peso}} == 4)
        <td width="20%">Media</td>
     else
        <td width="20%">Pesado</td> 

anyone could help me?