The phrase "a marked decrease in the number" is correct and usable in written English.
It can be used when discussing a significant reduction in quantity or frequency of something, often in statistical or analytical contexts.
Example: "The recent report indicated a marked decrease in the number of participants compared to last year."
Alternatives: "a significant drop in the number" or "a notable reduction in the number."
The facility has experienced a marked decrease in the number of incidents requiring a root cause analysis since the program was conducted.
Interestingly, knockdown of ERK5 led to a marked decrease in the number (p < 0.01) and size of HCT116-derived spheres (p < 0.001) (Fig. 2h), phenocopying the effects of XMD8-92 treatment.
Histological and immunohistochemical analyses of the tissues of G93A/HGF mice revealed a marked decrease in the number of microglia and reactive astrocytes and an attenuation of the loss of motoneurons in facial and hypoglossal nuclei compared with G93A mice.
Based on data released by the Department of Communities and Local Government last month, they show how many inner city boroughs have seen a marked decrease in the number of areas classed as the least deprived in the past decade.
In whole wheat flour tarhana (WWFT) and CT, a marked decrease in the number of thermophilic LAB was observed.
There has been a marked decrease in the number of users of home-based care services for people aged 80 years and over.
It was shown that in vitro exposure of bacteria to cigarette smoking resulted in a marked decrease in the numbers of viable bacteria [ 14, 15].
Synovial tissue analysis revealed a marked decrease in the total number of cells, especially in the number of macrophages and CCR1+ cells after treatment (Fig. 1).
However, rats bearing astrocytomas had a marked decrease in the absolute number of the various lymphocyte subpopulations as a result of lymphopenia.
This quiescence is represented as a marked decrease in the mtDNA copy number and also linked with down-regulation of genes in various molecular pathways.
Follow-up angio magnetic resonance imaging (MRI) on hospitalization day 20th demonstrated a marked decrease in the size and number of liver abscesses and no signs of thrombosis.
