Comparison of SDSG and CARDS classifications for L5/S1 lumbar degenerative spondylolisthesis: an independent inter- and intra-observer agreement study

Table 4 Inter-observer reliability of CARDS classification

Observers^a	Cases in agreement between observers					Agreement (%)	K
Observers^a	Type A	Type B	Type C	Type D	Total	Agreement (%)	K
1-2	14	38	32	5	89	76.1	0.663
1-3	13	34	30	6	83	70.9	0.597
1-4	14	39	33	7	93	79.5	0.701
1-5	12	33	30	5	80	68.4	0.572
2-3	11	34	31	6	82	70.1	0.589
2-4	12	34	33	5	84	71.8	0.610
2-5	14	32	32	5	83	70.9	0.596
3-4	13	37	33	7	90	76.9	0.673
3-5	12	34	33	6	85	72.6	0.628
4-5	12	33	30	5	80	68.4	0.573
Overall	-	-	-	-	-	72.6	0.620

ISSN: 1749-799X