The phrase "a persistent reduction in the" is correct and usable in written English.
It can be used when discussing a continuous decrease in a particular aspect or measurement, often in contexts like economics, health, or environmental studies.
Example: "The study revealed a persistent reduction in the levels of pollution over the past decade."
Alternatives: "a continual decrease in the" or "an ongoing decline in the".
"It's been predicted for several decades and we do seem to be seeing a persistent reduction in the surface area and the volume of northern hemisphere Arctic sea ice.
Here, we show that multiple, but not single, induction of LTD caused a persistent reduction in the number of dendritic synapses in cultured rat developing hippocampal neurons.
Similarly to the effects of parity on women, the OFA rats have a persistent reduction in the concentration of serum PRL and blunted PRL response to secretagogues.
In the mouse exposure study, acute toxic effects were observed as a persistent reduction in the tidal volume and expiratory flow rate and associated with a transient increase in the respiratory frequency.
For example, parity in women causes a persistent reduction in the concentration of prolactin in serum [ 10, 11], and similarly parous rats have a significantly reduced circulating concentration of growth hormone (GH) as compared with nulliparous, age-matched animals [ 2].
Beyond a transient effect of slowing down adaptation, transformation may also lead to a persistent reduction in mean fitness of the population when there is spatial heterogeneity, caused by the biofilm structure, in selection pressure.
Interestingly, in this study, the authors also evaluated the effect of repeated administration of CCI-779 (4 injections every 24 hours) observing a persistent reduction in mechanical allodynia which was gradually lost 48 hours after the last administration [ 45].
A persistent reduction in parenting stress has already been reported in our study by mothers in the intervention group, compared to mothers of preterm controls [ 26, 27].
Furthermore, at 4 years of follow-up, the EVAR-1 Trial also demonstrated a persistent reduction in aneurysm-related mortality in EVAR patients compared with those who received open repair (4% vs 7%) [3].
Induction of RNAi in these cells results in a persistent reduction in growth rate after 24 h (Fig. 6A), which is preceded by a strong reduction in the levels of TbKIN13-1 in cells (Fig. 6B).
The major finding from this study is that addition of WCS to the diet of lactating dairy cows resulted in a persistent reduction in CH4 emissions (g of CH4/kg of DMI) over a 12-wk period and that these reductions in CH4 are consistent with previous work that has studied the addition of oilseeds to ruminant diets.
