Conditional logic for default choices

I want to use radio buttons and checkboxes to control the default selection based on previous input. For example, I have a form that asks for weight and height and calculates the BMI in a hidden field. Then I have a radio button field with two choices: true and false. This field is also hidden. I want either true or false to be selected automatically based on the BMI. Example = if BMI is over 43, the default answer should be No; if it is under 43, the default answer should be Yes.

I am using a custom webhooks script that makes it to where I must ask the hidden question once. I cannot create two fields and leverage conditional logic. If I was to do this, our custom webhook will post the question twice.

I hope I can figure a way to change the selection on a hidden field based on if a number from a previous question is above 43.

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