- fold rise; fold increase = x-voudige toename
- fold change = x-voudige verandering
See e.g.: https://eur-lex.europa.eu/legal-content/en-nl/TXT/?uri=CELEX:32014R0900
Fold change is a measure describing how much a quantity changes between an original and a subsequent measurement. It is defined as the ratio between the two quantities; for quantities A and B the fold change of B with respect to A is B/A. In other words, a change from 30 to 60 is defined as a fold-change of 2. This is also referred to as a "one fold increase". Similarly, a change from 30 to 15 is referred to as a "0.5-fold decrease". Fold change is often used when analysing multiple measurements of a biological system taken at different times as the change described by the ratio between the time points is easier to interpret than the difference. (https://en.wikipedia.org/wiki/Fold_change)