TABLE 1.

Variables and assigned values for eight factors with possible influence on outcomes

Influencing factor	Variable	Assigned values
Age (y)	X1	<18 = 0, ≥18 = 1
Sex	X2	M = 0, F = 1
Duration of abuse (months)	X3	<3 = 0, ≥3 = 1
Duration of medical history (months)	X4	<3 = 0, ≥3 = 1
Vitamin B12 deficiency	X6	No = 0, Yes = 1
Elevated homocysteine	X7	No = 0, Yes = 1
Anemia	X8	No = 0, Yes = 1
Spinal MRI	X9	Normal = 0, Abnormal = 1
Complete recovery	Y	No = 0, Yes = 1

MRI, magnetic resonance imaging.