Sql case when

Good morning from Santo Domingo 
Please can you help me with this ? How could I simplify or improve this ?:

  SELECT  @total1 = (case when @RT = 0 then AVG(ButacaADLida*@ADL1)+AVG(ButacaNinos212Ida*@CHD1) else AVG(ButacaADL*@ADL1)+AVG(ButacaNinos212*@CHD1) end ),  @total2 = (case when @RT = 0 then AVG(ButacaADLida*@ADL2)+AVG(ButacaNinos212Ida*@CHD2) else AVG(ButacaADL*@ADL2)+AVG(ButacaNinos212*@CHD2) end ),  @total3 = (case when @RT = 0 then AVG(ButacaADLida*@ADL3)+AVG(ButacaNinos212Ida*@CHD3) else AVG(ButacaADL*@ADL3)+AVG(ButacaNinos212*@CHD3) end ), @Interna = (case when @RT = 0 then AVG(CabInteriorIda) else AVG(CabInteriorReg) end ), @Externa = (case when @RT = 0 then AVG(CabExteriorIda) else AVG(CabExteriorReg) end ), @Suite = (case when @RT = 0 then AVG(suiteida) else AVG(suitereg) end ), @Master = (case when @RT = 0 then AVG(masterida) else AVG(masterReg) end ), ...