"was primarily attributed to" is a correct and usable phrase in written English.
It is commonly used to explain the main cause or reason for something. Example: The decline in sales was primarily attributed to the economic recession.
The loss was primarily attributed to a one-time charge on the sale of its fixed-line business to the American investment group, Ripplewood Holdings.
The October increase was primarily attributed to a 14 percent gain in motor vehicles and parts sales, and in sales at gasoline stations.
The improvement was primarily attributed to the outperformance of SVM-PTFs calibrated on structureless soils.
This was primarily attributed to increased substrate catalyst interactions resulting in catalyst poisoning.
This was primarily attributed to the increase in compressive strength resulting from increasing the maturity of each concrete mixture.
The higher lodging index of rice plants was primarily attributed to the weak breaking strength of the lower internodes.
The genetic improvement in yield was primarily attributed to the utilization of two elite parents Yumai 2 and Zhou 8425B.
Once more, the decrease in the overall toxicity of the organic xenobiotics with rising wastewater flow was primarily attributed to a dilution effect.
The loss-of-function of PSII was primarily attributed to selective subunits, such as PsbP and PsbQ of OEC and PsbR.
China's forest fragmentation was primarily attributed to anthropogenic disturbances, driven particularly by agricultural expansion from an increasing and large population, as well as poor forest management practices.
Tailing of BTCs nevertheless occurred and was primarily attributed to nonlinear sorption due to specific interactions in the sorption processes rather than to sorption nonequilibrium.
