I'm hazarding a guess here, but in experimenting, I think what I need to do is set up 3 hidden equation questions:
Obesity1 with equation: {if ((BMI ge 30 && BMI le 34.9), "1","0")}
Obesity2 with equation: {if ((BMI ge 35 && BMI le 39.9), "1","0")}
Obesity3 with equation: {if ((BMI > 40), "1","0")}[/li]
And then a quota for each, like:
Am I on the right track?