The phrase "and compared levels of" is correct and usable in written English.
It can be used when discussing a study or analysis that involves evaluating or measuring different quantities or intensities of something.
Example: "The researchers conducted a survey and compared levels of satisfaction among different age groups."
Alternatives: "and analyzed the degrees of" or "and assessed the amounts of".
Then they re-analyzed the data that was produced in a similar study on another organism (little skate, Leucoraja erinacea) and compared levels of gene expression among different areas of the fin within and between organisms.
To study age-related changes in human TM cells, we isolated primary TM cell cultures from young (ages 9, 14, and 25) and old (ages 66, 70, and 73) donors, and compared levels of oxidized proteins, autofluorescence, proteasome function, and markers for cellular senescence.
We examined and compared levels of these transcripts in MCF10A-Ras cells either expressing or lacking Stat3 and found no significant differences (data not shown).
To avoid contamination with normal tissues, we isolated breast cancer cells by microdissection and compared levels of methylation with those in normal breast epithelial cells from the same patients.
To explore a possible correlation between analyte serum concentrations and the disease type and localization, we stratified cases by peritoneal, deep, or ovarian endometriosis and compared levels of total PCBs, C-TEQs, HCB, and p,p′-DDE among groups.
We investigated whether cigarette smoking interacts with preeclampsia to affect fetal growth, and compared levels of soluble fms-like tyrosine kinase-1 (sFlt-1), a circulating anti-angiogenic protein, in preeclamptic smokers and non-smokers.
To describe and compare levels of physical activity and sedentary behavior in schoolchildren from 34 countries across 5 WHO Regions.
To measure and compare levels of extremely-low-frequency magnetic field (ELF-MF) exposure to surgeons during laparoscopic and robotic gynecologic surgeries.
To determine and compare levels of levonorgestrel (Lng) in serum and peritoneal fluid (PF) of patients on the Lng intrauterine system Mirena® (Schering Health, Berlin, Germany) for endometriosis and to relate these to symptoms.
Studies to identify other mechanisms are moving forward, including genome sequencing of about 10 Castleman patients and their parents, and comparing levels of proteins during flares and remissions. .
The team used this ratio as a benchmark to identify and compare levels of mercury pollution caused by human activities across water samples from different oceans.
