The phrase "a variable percentage" is correct and usable in written English.
It can be used when discussing amounts or rates that can change or vary depending on certain conditions or factors.
Example: "The interest rate on the loan is a variable percentage that may fluctuate over time based on market conditions."
Alternatives: "an adjustable percentage" or "a fluctuating percentage".
A variable percentage of these pollutants are assimilated within the swamp.
These payments may also be a variable percentage of the prescribed drug's price.
For every microprocessor a PC company buys from Intel, they get reimbursed a variable percentage of their advertising outlays.
A variable percentage of participants (20 35 %) correctly identified the chest X-ray equivalents from other common examinations.
Secondly, it considers the mechanical strengths of the Portland cement mortars containing a variable percentage of volcanic powders (10, 15, 20, 25, and 30%).
A significant consequence of equine arteritis virus (EAV) infection of horses is persistence of the virus in a variable percentage of infected stallions.
Interestingly, the tumours contained a highly variable percentage and a variable expression level of CD133+ and CD15+ tumour cells (Supplementary Fig. 5B).
Y represented either a quantitative variable (percentage of infected piglets, or ADG) or a binomial variable (pattern of glycosylation).
Although the median PVL was determined to be 1.5%, a highly variable percentage of infected cells was observed in included individuals (interquartile range of 0.12-5.3%).
After refinement of the initial model by backwards stepwise elimination, the best-fit model was one that included a single variable, percentage weight loss (more lean tissue loss when greater percentage weight loss; R = −0.55, R 2 = 0.31, P = 0.003; Table 6).
From our previous experience [ 28, 29], and as recently demonstrated by Laakso et al. [ 25, 26], it has been apparent that whereas in some tumours virtually every cell expresses the basal marker (CK14, in this instance), others may show a focal or variable percentage of positive cells.
