According to examples, an apparatus may include a processor and a memory on which is stored machine readable instructions executable by the processor to access test parameters of a patient； calculate average values for each of the accessed test parameters having a reference value range and assign binary coefficient values to the accessed test parameters based on comparison of the average value to the range limits； assign binary coefficient values to the accessed test parameters that do not have the reference value range based on a test parameter presence； generate a patient parameter matrix based on the assigned binary coefficient values； and apply statistical processing to the patient parameter matrix to make a diagnosis.
