"a predictive factor" is correct and usable in written English.
You could use it in a sentence like this: "Researchers have identified obesity as a predictive factor of heart disease."
But the researchers found that age of first menstruation, or menarche, is a predictive factor independent of physique.
Kamarck, one of the founders of Bill Clinton's New Democrat movement, says that Douglas Hibbs's model, which presents real disposable income as a predictive factor for elections, shows that Obama's in a tough spot.
Pleural retraction in a pure ground glass nodule is a predictive factor for invasiveness.
The blood gas parameters have not yet been reported as a predictive factor for ROSC.
P71 Metabolic acidosis uncompensated by kidney in septic patients: a predictive factor for acute kidney injury?
Therefore, the authors concluded that KRAS mutation status was not a predictive factor for chemotherapy [19].
The role of platelets as a predictive factor for HCC recurrence is still controversial.
Macrophage phenotype during these processes is a predictive factor of the eventual remodeling outcome.
The area of oral erythroplakia is a predictive factor for postoperative recurrence.
Body mass index as a predictive factor of periodontal therapy outcomes.
The validity of the Risser sign as a predictive factor is still controversial.
