[Sheet Worker] Select the highest number from this list

I have 8 sets of radio buttons.  Each set is named "healthbox_(number).  I want to make a script worker that selects the highest of those numbers and displays it in a numberbox named "injury". How do I do that? Bonus Question: I would love to round down the number selected.  How does that happen?

Highest Value & Round: getAttrs(['healthbox_1', 'healthbox_2'], (v) => { Math.floor(Math.max.apply(null, Object.values(v))); });

No understanding.  Would the total code look like: on("change:healthbox_1 change:healthbox_2 change:healthbox_3 change:healthbox_4 change:healthbox_5 change:healthbox_6 change:healthbox_7 change:healthbox_8 sheet:opened", function() {     getAttrs(['healthbox_1', 'healthbox_2', 'healthbox_3', 'healthbox_4', 'healthbox_5', 'healthbox_6', 'healthbox_7', 'healthbox_8'], function(values) {         setAttrs({              injury: Math.floor(Math.max.apply(null, Object.values(healthbox_1, healthbox_2, healthbox_3, healthbox_4, healthbox_5, healthbox_6, healthbox_7, healthbox_8))); });

Correct except the 4th line. Replace all the fields with "Object.Values(values)"

That works beautifully.  Thank you very much!