is numeric, is not numeric

is numeric evaluates as true if the value is a number or a one-sided range like “<0.6”. Similarly, is not numeric evaluates as true if the value is not a number. For example, given the following case fragment:

	Cholesterol     7.3    5.6    6.1
	Triglyceride    1.1    0.8    pending
	HDL                    2.2    1.9
	Troponin               <0.6   7.0

Cholesterol is numeric

Triglyceride is not numeric

HDL is numeric

Previous troponin is numeric

Troponin has increased by more than 10 percent

Also:

at least 3 cholesterol are numeric

at most 1 Triglyceride is not numeric