Lumbar Radiofrequency Rhizotomy in Patients with Chronic Low Back Pain Increases the Diagnosis of Sacroiliac Joint Dysfunction in Subsequent Follow-Up Visits

Table 2

Symmetric measures. Phi and Cramer’s were calculated to assess strength of association between the two dichotomous variables, Sacroiliac joint dysfunction, and history of Lumbar Radiofrequency.

Measure (nominal by nominal)	Value	Approximate significance ()
Phi	0.524	<0.001
Cramer’s	0.524	<0.001