Percent Change From Nadir in Sum of Products of Perpendicular Diameters

**Semantic type:** Quantitative Concept

**Definition:** The most recently recorded sum of products of perpendicular diameters minus the lowest sum of diameters previously recorded divided by the lowest sum of products of perpendicular diameters previously recorded, multiplied by 100.

**Synonyms:** - PCNSPPD - Percent Change From Nadir in Sum of Area - Percent Change Nadir in Sum of PPD - Percent Change Nadir in Sum of PPD