'a threshold effect of' is correct and usable in written English.
You can use this phrase to describe the point at which a certain effect or response begins to become noticeable, or the point at which it changes in intensity. For example, "The research demonstrated a threshold effect of 50 mg for the drug to have an effect on the patient's symptoms."
Moreover, a definition of groups using PaO2 presupposes a threshold effect of oxygen and eliminates a dose-dependant effect.
Thus, no graded response was observed from 16∶1 to 2∶1 POPC/cholesterol ratios, suggesting a threshold effect of cholesterol concentration.
Moreover, there was evidence for a threshold effect of vaccine efficacy, with outbreaks significantly smaller for high (≥80%) compared with low (≤70%) levels of efficacy (b = −0.72, 95% CI: (−1.01,−0.43); P<0.001) (Figure 3D).
This observation is in agreement with data from the conditional mouse models that suggest a threshold effect of ISC enzyme activities that is both tissue-specific as well as dependent on the disease progression [8].
This finding may suggest a threshold effect of the association.
These results suggest a threshold effect of drug dosage on cranial dysmorphogenesis.
Given the close pathophysiological association between albuminuria and cardiovascular disease, serum 25(OH D levels could also have a threshold effect on levels of UAE.
Therefore, we cannot rule out the possibility that SUA level has a threshold effect on the risk of type 2 diabetes rather than a dose-response effect.
NO3− reduced the number of offspring produced with an approximate threshold effect concentration of 123 mg N/L (Fig. 4C) and increased the incidence of developmental abnormalities with a threshold effect concentration of approximately140 mg N/L (Fig. 5C).
Sodium nitroprusside reduced the number of offspring produced per maternal daphnid in a concentration-dependent manner with a threshold effect concentration of ∼0.34 mg N/L (Fig. 4A).
These data also support the concept of a threshold effect in diversification of the mammals progress awaited morphogenetic innovation.
