A comparison between the low back pain scales for patients with lumbar disc herniation: validity, reliability, and responsiveness

Table 3 Pearson correlation coefficient (r) between each low back pain scales

Scales	Q1 Low back pain	Q2 Lumbar function	Q3 Walking ability	Q4 Social life function	Q5 Mental health	NPRS	ODI	RMDQ	SF-36 PCS	SF-36 MCS
JOABPEQ
Q1 Low back pain	1	0.556^a	0.523^a	0.580^a	0.496^a	−0.415^a	−0.537^a	− 0.627^a	0.659^a	0.517^a
Q2 Lumbar function	0.556^a	1	0.569^a	0.679^a	0.556^a	− 0.429^a	− 0.634^a	− 0.751^a	0.701^a	0.553^a
Q3 Walking ability	0.523^a	0.569^a	1	0.736^a	0.535^a	−0.426^a	− 0.701^a	− 0.725^a	0.604^a	0.536^a
Q4 Social life function	0.580^a	0.679^a	0.736^a	1	0.630^a	−0.457^a	− 0.715^a	− 0.724^a	0.730^a	0.636^a
Q5 Mental health	0.496^a	0.556^a	0.535^a	0.630^a	1	−0.388^a	− 0.587^a	− 0.597^a	0.724^a	0.736^a
NPRS	−0.415^a	−0.429^a	− 0.426^a	−0.457^a	− 0.388^a	1	0.449^a	0.485^a	−0.519^a	−0.413^a
ODI	−0.537^a	−0.634^a	− 0.725^a	−0.715^a	− 0.587^a	0.449^a	1	0.736^a	−0.682^a	−0.601^a
RMDQ	−0.627^a	−0.752^a	− 0.701^a	−0.724^a	− 0.597^a	0.485^a	0.736^a	1	−0.764^a	−0.614^a
SF-36 PCS	0.659^a	0.701^a	0.604^a	0.730^a	0.724^a	−0.519^a	−0.682^a	− 0.764^a	1	0.779^a
SF-36 MCS	0.517^a	0.553^a	0.536^a	0.636^a	0.736^a	−0.413^a	−0.601^a	− 0.614^a	0.770^a	1

JOABPEQ Japanese Orthopaedic Association Back Pain Evaluation Questionnaire, NPRS Numerical Pain Rating Scale, ODI Oswestry Disability Index, RMDQ Roland-Morris Disability Questionnaire, SF-36 Short Form Health Survey, PCS Physical Component Summary score, MCS Mental Component Summary score
According to Cohen’s criteria, r = 0.2 can be considered a small correlation, r = 0.5 is a medium correlation, and r = 0.8 is a large correlation
Notes
^aCorrelation is significant at the 0.01 level (2-tailed)

ISSN: 1477-7525