For loop to multiple columns

I have the following block of code:

%RSI Calculation
n = [14:2:18];

for i = 1:n
    gainC = diff(ABC).*((diff(ABC))> 0);
    lossC = -(diff(ABC)).*((diff(ABC)) < 0);
    avg_gainC = movmean(gainC,[i-1 0],'omitnan'); 
    avg_lossC = movmean(lossC,[i-1 0],'omitnan'); 
    RS = (avg_gainC ./ avg_lossC);
    ABC_RSI = 100 - (100 ./ (1+RS));
end

I need to know how I can create a table 'ABC_RSI' with the columns 14w_RSI, 16w_RSI, 18w_RSI and populated using the formula. Can someone please help?