The phrase "affected the levels of" is correct and usable in written English.
It can be used when discussing the impact or influence of one variable on the quantity or degree of another variable.
Example: "The new policy affected the levels of employee satisfaction across the organization."
Alternatives: "influenced the amounts of" or "altered the rates of".
Third, this study explored whether length of maternity leave indirectly affected the levels of attachment security by affecting the quality of mother child interactions.
Results showed that the peening time strongly affected the levels of oxygen concentration at the treated surface; the longer the peening time, the higher the oxygen concentration.
Enzyme assay conditions significantly (P < 0.05) affected the levels of activity of NADH peroxidase in the opposite direction of NADH oxidase; higher enzyme activity was observed under non-aerated assay conditions (148.3 ± 9.7 vs. 197.3 ± 1.7 units/mg) (Table 2).
Since the adolescents' growth status likely affected the levels of biomarkers assessed, the status of their femoral and tibial growth plates was assessed at BL and FU with magnetic resonance imaging (MRI).
The cities in India undergone a continual shift in population and development trends and these have tremendously affected the levels of urban runoff water (Hessen et al. 1997; Avvannavar and Shrihari 2008).
A team of dermatologists headed up by Anthony Young of the St . Johns Institute of Dermatology at Kings College London was initially studying how UV light affected the levels of matrix metalloproteinase 1 (MMP-1), an enzyme that chops up proteins.
Questionnaire data showed that opening of windows occurred less frequently in homes immediately post-renovation compared to pre-renovation; this factor likely affected the levels of indoor black carbon (from outdoor sources) and formaldehyde (from indoor sources) more than the renovation status itself.
Insulin affected the levels of VDR in both species.
Neither ethanol nor ADH transgene affected the levels of pan LKB1.
Neither empty-vector nor co-expressed GFP affected the levels of each Dvl (not shown).
