The phrase "a decrease in the index" is correct and usable in written English.
It can be used when discussing changes in numerical data, statistics, or measurements related to an index.
Example: "The recent report indicated a decrease in the index, suggesting a downturn in market performance."
Alternatives: "a drop in the index" or "a decline in the index."
It was determined that an increase in the S&P 500 was associated with a decrease in aggregate risk tolerance during the period of analysis, whereas a decrease in the index increased willingness to take financial risk during the same period.
Conversely, a decrease in the index potentially signals a flagging economy.
Thus, elevated atmospheric CO2 concentrations resulted in a decrease in the index of N nutrition of grasses (Soussana and Hartwig, 1996; Zanetti et al., 1997), which indicates an increased N-limitation to growth.
Good outcome was described as a decrease in the Lawton Index (≤2 points) and/or Barthel Index (≤20 points) and/or EQ-5D vas (≤20 points), compared to pre-ICU status.
Our results demonstrated a LGG-BB-12-induced decrease in the plaque index, which promoted a decrease in the gingival index.
Hence, the decrease in the FFT amplitude could be explained by a decrease in the refractive index contrast at the pSi/polyNIPAM interface, which is based on the different refractive indices of the swollen (RI ~ 1.33) and collapsed polyNIPAM spheres (RI ~ 1.40) [26].
Differential scanning calorimetry (DSC) data indicated a decrease in the crystalline index (Xc) for both neat bitumen and bitumen nanocomposites with increasing the mixing rate.
The film properties show a decrease in the refractive index, from 2.51 at 50 kHz to 2.41 at 350 kHz, and early failure during wear testing for pulsing frequency of 300 and 350 kHz.
The model is able to explain the two interesting features of this polymerization, namely: (i) a slow increase in μn with time during the initial period, followed by a sharp increase for a short duration; and (ii) a decrease in the polydispersity index at some intermediate time, associated with the mixing of several polymeric species having different individual chain-length distributions.
We noted a decrease in the maturation index with the longer femoral lengthenings.
A previous report showed that the increase in intra-abdominal pressure during pneumoperitoneum can lead to an increase in systemic vascular resistance and central filling pressures and a decrease in the cardiac index, which may be detrimental in elderly patients with limited cardiac reserve [14].
