Table 4.

Shows correlation amongst change in score of various patient reported outcome instruments. Pearson’s correlation coefficient (r) was used to check the strength of association and ∗ indicates significant p value. (ODI = Oswestry disability index; RMDQ = Roland Morris Disability Questionnaire; SF-12 PCS = Physical component of Short Form-12; SF-12 MCS = Mental component of Short Form-12).

Patient reported outcome instruments	ODI r (p-value)	RMDQ r (p-value)	SF-12 PCS r (p-value)	SF-12 MCS r (p-value)
ODI	1
RMDQ	0.650 (p < 0.0001)∗	1
SF-12 PCS	- 0.646 (p < 0.0001)∗	- 0.511 (p < 0.0001)∗	1
SF-12 MCS	- 0.378 (p = 0.03)∗	- 0.478 (p < 0.0001)∗	0.106 (p = 0.40)	1