"decreased threefold" is correct and usable in written English.
You can use it to indicate that something has decreased to one third of its original size or quantity. For example: "Due to the economic downturn, profits have decreased threefold."
In addition, during mitosis of HT-29 cells, Src specific activity increased two- to threefold more, while Yes activity and abundance decreased threefold.
Annually inventoried areas have decreased threefold during the last decade, and the obsolescence of forest inventory data has become critical.
After 6 months of treatment plasma CXCL13 decreased threefold to 48.1 pg/ml (26.9 pg/ml to 93.0 pg/ml), P <0.001.
Myc protein levels were more substantially decreased (threefold to fourfold) upon introduction of the Myc shRNAs [see Figure S1 in Additional file 2].
Quantitative PCR showed that the mRNA expression of Nell-1 in the gastric cancer tissues was decreased threefold compared with that in the normal tissues.
Likewise, casualties per incident in Israel decreased threefold between 1975 and 1979, assumed by Adler et al. to result from smaller explosive charges used due to tighter security measures [ 25].
Normalized marrow contrast enhancement (NMCE) of uninstrumented WT vertebrae significantly decrease, threefold (p < 0.01) from 8 to 12 weeks of age, while the NMCE of TNF-Tg vertebrae remained elevated.
Such doses are consistent with the results from the McGill Geriatric Lithium-Induced Diabetes Insipidus Clinical Study (Rej et al. 2014b) reporting that the lithium dose required to achieve a given serum concentration decreases threefold from middle to old age.
The most effective in inducing disorder in the hydrophilic region of the erythrocyte membrane is the apple extract, the GP value decreasing threefold with the highest concentration used 0.05 mg/ml.
After getting the result of the l p calculation, the transition from the IPEC to the IMC was found to be accompanied with increasing of the effective size of region heterogeneity, while at transforming from the IMC into the PEC Ag0 nanocomposites, effective size of heterogeneity decreased almost threefold (Table 1).
