The phrase "a decrease in the proportions of" is correct and usable in written English.
It can be used when discussing statistical changes or trends in data, particularly in contexts such as research, reports, or analyses.
Example: "The study revealed a decrease in the proportions of participants who reported experiencing anxiety over the past year."
Alternatives: "a reduction in the percentages of" or "a decline in the rates of".
Application of the brassinosteroid synthesis inhibitor caused a decrease in the proportions of these amino acids and intensified the adverse effects of salinity on nitrate concentration and activity of nitrate reductase.
The unadjusted trend estimate indicated a decrease in the proportions of medullary tumors with increasing time since birth.
The two following periods did not show a decrease in the proportions of patients developing AIDS within 2 and 10years in comparison to 19972000.
Additionally, the preponderance of genes decreased in expression may reflect a decrease in the proportions of cell types expressing these transcripts, highlighting the importance of the between breed contrasts.
Addition of HGH caused a decrease in the proportion of insulin bound to antibody.
Miliband, meanwhile, has suffered from a decrease in the proportion of people who approve of him – from 22% to 21%.
The DCMS report also revealed a decrease in the proportion of working adults using public library services over the last two years, from 33.4% in 2013/2014 to 31% in 2015/2016.
A decrease in the proportion of further education colleges offering physics may reflect the economic pressures they are under not to offer classes for small numbers of students.
As the economy improves and more parents find work, this leads to a decrease in the proportion of pupils eligible for free school meals".
If one thinks about polarization in partisan terms, one would expect to see an increase in the proportions of Democrats and Republicans and a decrease in the proportion of independents.
We found that decreased intrinsic demand, mediated by a decrease in the proportion of highly metabolically active tissues in the fifth instar, along with a decrease in the specific mitochondrial activity, contribute to the hypoallometric scaling of metabolic rate.
