The phrase "a primary factor of" is correct and usable in written English.
It can be used when discussing the main reasons or elements that contribute to a particular outcome or situation.
Example: "The lack of funding was a primary factor of the project's failure."
Alternatives: "a key element of" or "a major contributor to".
Air entrained during the transfer of bulk materials from one belt conveyor to another is a primary factor of dust emissions.
Persistent hyperglycemia was indicated to be a primary factor of high uptake of glucose into brain, red blood cells, and kidney and subsequently induced cellular oxidative stress [ 10].
Moreover, some SCN5A mutations which have been found to be a primary factor of leading DCM were characterized by an age-related phenotype of cardiac dilation with different types of arrhythmia [ 11, 20].
However, diabetes and hypertension are unlikely to be a primary factor for the increment of FGF-21 in CHD patients, since CHD patients without diabetes and hypertension had significantly higher FGF-21 levels than normal controls.
These suggest that the high predation pressure is a primary factor for the acquisition of maternal care in these insects.
Shade provision by street trees during the hot summer months is a primary factor for the thermal comfort of people in urban areas.
Growth performance is a primary factor for determining the productivity of broiler chickens.
A primary factor for lowering the fracture energy of those sediments is currently unclear and will be investigated in detail in future work.
During several steps, a total of seven items were eliminated because they did not contribute to a simple factor structure and failed to meet a minimum criteria of having a primary factor loading of 0.4 or above, and no cross-loading of 0.3 or above.
During several steps, a total of eleven items from the initial version of the scale were eliminated because they did not contribute to a simple factor structure and failed to meet a minimum criteria of having a primary factor loading of 0.35 or above.
Item values were retained if they had a primary factor loading of >0.40 and a secondary factor loading of <0.30 [ 29].
