Degenerative findings on MRI of the cervical spine: an inter- and intra-rater reliability study

Table 3 Intra-rater reliability estimates

MRI finding	n	Reader pair	Observed agreement (%)	Agreement by chance (%)	Kappa (95% CI)
Kyphosis^a	50	A1A2	96.0	59.6	0.90 (0.85; 0.96)
Disc height^b	200	A1A2	84.0	51.5	0.67 (0.57; 0.77)
Disc contour^b	174	A1A2	88.5	43.9	0.80 (0.71; 0.87)
Spinal canal stenosis^b	50	A1A2	94.0	76.6	0.73 (0.51; 0.90)
Vertebral endplate signal change	Too low prevalences (i.e. ≤ 10%)
Uncovertebral osteoarthritis^c	281	A1A2	90.4	67.0	0.71 (0.61; 0.81)
Zygapophyseal osteoarthritis^c	240	A1A2	90.8	68.8	0.71 (0.59; 0.82)
Neural foraminal stenosis^c	287	A1A2	90.6	62.6	0.75 (0.66; 0.84)

^an refers to the number of MRIs assessed
^bn refers to the number of disc levels assessed
^cn refers to the number of anatomical sites assessed (by pooling right and left hand side)