"are relatively consistent" is correct and usable in written English.
You can use it to describe something that is generally in line with expectations, or that does not have significant or sudden changes. For example: "The temperature of the lake is relatively consistent throughout the year."
Amy Lane, past president of the association, said in a telephone interview that although each state might have different licensing regulations, the steps are relatively consistent throughout the United States.
These findings are relatively consistent with the theoretical assumptions.
Overall, the results are relatively consistent across both employment measures.
The results indicate that Cths acquired from both OCP and LPR techniques are relatively consistent.
What is remarkable is that the trends of the cluster characteristics are relatively consistent despite different experimentalists and units.
When employed in general population samples, prevalence estimates of bipolar disorder are relatively consistent across studies in Europe and USA.
The results are relatively consistent, as they all show a statistically significant association between an increase in particulate pollution and cardiopulmonary mortality.
The timings of these direction changes are relatively consistent from sol to sol; however, the wind direction and speed at any given time shows considerable intersol variability.
That explains why foreclosure rates in these towns are double or triple the national average of 3%, even though unemployment rates are relatively consistent with the national average.
While policies (e.g., teaching loads, committee structures), disciplinary norms, and faculty interactions may differ considerably across contexts, they are relatively consistent within a single department.
For northern damage sites along the Bungo Channel, the smaller-earthquake scenario and sub-slip model 3 are relatively consistent with historical tsunami heights.
