The phrase "at usual levels" is correct and usable in written English.
It can be used to describe a situation where something is occurring or being measured at a standard or expected rate or amount.
Example: "The production output has returned to at usual levels after the maintenance was completed."
Alternatives: "at normal levels" or "at typical levels".
Contrary to previous belief, at usual levels of consumption, coffee is not any more of a diuretic than the equivalent amount of water.
Seidlmayer has shown that the annual Nile floods were at usual levels at Nynetjer's time up to the period of the Old Kingdom.
These results provide evidence that at usual levels of exposure seen in these men and women, methylmercury exposure is unlikely to increase the risk of diabetes.
These findings from two separate large prospective cohorts do not support adverse effects of methylmercury on development of diabetes in men or women at usual levels of exposure seen in these populations.
All the estimates are statistically significant at the usual levels.
When using fixed effects (Column 4) or "double selected" LLM characteristics (Column 6), population seems to be negatively affected on average, but the presence of affordable housing seems to compensate this effect (the results from controlling for the full set of f i ′ variables are similar but not significant at the usual levels).
When we compared adjusted-ARQ to the difference in DTI measures of these two pathways, we did not find a significant correlation either TD or FA of these superior and inferior frontal tracts, indicating that the ARQ-related structural changes were not the result of an imbalance between cognitive control and hedonic brain circuits (at least at the usual level of statistical significance).
Patients were questioned about the status of their chronic respiratory symptoms (dyspnea, cough, sputum production, viscosity and purulence), and the responses were graded at 1 (at the usual level), 2 (somewhat worse than usual) or 3 (much worse than usual).
Accelerated life tests provide information quickly on the lifetime distribution of the products by testing them at higher than usual levels of stress.
Rainfall is at a fraction of its usual levels, heat at historical highs.
At 33, he's young enough to perform at his usual level, health permitting.
