The phrase "a significant decrease in the proportion" is correct and usable in written English.
You can use it when discussing statistical data or trends that indicate a notable reduction in a specific ratio or percentage.
Example: "The study revealed a significant decrease in the proportion of smokers among teenagers over the past decade."
Alternatives: "a notable reduction in the percentage" or "a marked decline in the ratio."
This marks a drop of 30.7% over the decade, and is the first time the government department has highlighted a "significant decrease" in the proportion of adults who used public libraries.
The study also found a significant decrease in the proportion of people reporting that they did not know anyone with a mental health problem, down from a quarter in 2010 to 19% in 2015.
We observed a significant decrease in the proportion of intestinal-villi perfused (%villi-PPV) at TS in both dobutamine and placebo groups.
The hypnogram showed a significant decrease in the proportion of REM and an increase in the proportion of stage 2, at 60 dB(A) of steady pink noise exposure.
Analyses by MPA indicate a significant increase in the proportion of mitochondria in the ST state and a significant decrease in the proportion of mitochondria in the DP state in neurons expressing either Wt- or P525L-mutant FUS as compared with the control group (Fig. 4B and 4C).
While irradiation alone induced G2/M cell cycle arrest, the combination of F + RT induced cell redistribution in the G1 phase and produced a significant decrease in the proportion of cells in G2 phase arrest and in the S phase in breast cancer cells (p < 0.01).
RSLs carrying the LMr -GS from T. monococcum showed a significant decrease in the proportion of polymeric protein (−2·8%, p<0·0001), SDS sedimentation volume (−8·1%,p =0·03) and gluten strength (−16·5%, p=0·01), and a significant increase in cookie quality (5·9%, p=0·05).
There was a significant decrease in the proportion of EC ELISPOT positive cases over the treatment period (p<0.001).
There was a significant decrease in the proportion of IUU vessels flagged to CCAMLR countries, and a significant decrease in the average governance index of flag states.
