A physician, after examining a group of patients of a certain disease, classifies the condition of each one as ‘Normal’, ‘Mild’, ‘Moderate’ or ‘Severe’. Which one of the following is the scale of measurement that is being adopted for the classification of the disease condition?

In the given question, a physician, after examining a group of patients of a certain disease, classifies the condition of each one as ‘Normal’, ‘Mild’, ‘Moderate’ or ‘Severe’. ‘Normal-mild-moderate-severe’ is a continuum of outcome for a variable, thus is measured on a ordinal scale.