"underwent a decrease" is a correct and usable phrase in written English.
You can use it whenever you want to refer to something that has had a decrease in quantity, size, or intensity. For example: "Sales in this region underwent a decrease of 8% in the first quarter of the year."
WCR populations may thus have underwent a decrease in size in Serbia and in southern Hungary, with this decrease more persistent in Serbia, but no such decrease in population size was observed further north.
Liver cells from PiT1Δ5/Δ5 embryos underwent a decrease in proliferation and a massive wave of apoptosis, suggesting that PiT1 provides a proliferation and survival signal for hepatocytes during a defined stage of liver morphogenesis.
In particular, the native β-sheet component at 1635 cm−1 underwent a decrease in intensity like the other forms, whereas the α-helix/disordered component at 1657 cm−1 first decreased until 30 h.
The incidence of LBP hospitalisation due to lumbar disc disorders underwent a decrease from 1993 onwards.
In this study, all of the hUC-MSC clones underwent a decrease in telomerase activity and shortening of telomere length and senesced in culture ultimately.
In contrast to cattle, mares given PGF on day 3 post ovulation underwent a decrease in the ultrasonographically detectable luteal tissue and a transient decrease in the blood progesterone concentration within 2 days.
Due to the smoother interaction between moving and stationary parts, turbulent kinetic energy undergoes a decrease of almost an order of magnitude.
The IFT values undergo a decrease with increased salinity up to around 2000 ppm NaCl, and then, a slightly increasing trend of IFT values was observed with further increase in salinity.
By focusing on the behaviour of N incorporation with respect to distance in Fig. 3b, it can be denoted that the N content undergoes a decrease as we move toward the wafer edge.
The study was designed to determine the three-dimensional organization of the rat intrinsic cardiac neural plexus (ICNP) and to ascertain whether the rat heart undergoes a decrease in neuronal number with aging as has been reported for other mammalian species, including human.
A decrease in fecundity is expected for Tropidurinae species on continental landmasses, which are predicted to undergo a decrease in summer rainfall.
