Explanatory Answer:
To determine the percentage weight loss, we can use the formula:
percentage weight loss = (initial weight - final weight) / initial weight x 100%
Using the given information, we can calculate the percentage weight loss for Patient X:
percentage weight loss = (65 kg - 52 kg) / 65 kg x 100%
percentage weight loss = 20%
Therefore, Patient X has experienced a 20% weight loss, which is considered severe.