Matt, I know we emailed about his last night, but I am going to post our solution to this issue here for others to use.
Pivot tables can be used to make two-way tables, but two-way tables require both variables to be categorical. Since BMRpM is a quantitative variable, it wouldn't work for two-way tables. However, you can convert a quantitative variable into a categorical variable by binning the data into intervals. For example, BMRpM can be binned into the intervals 0-1, 1-2, 2-3, and 4+. This would allow you to make a two-way table using BMRpM as one of the variables. In google sheets, you can use the ifs function to create the bins.