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

Table 1 Inter-observer reliability of SDSG classification

Observers^a	Cases in agreement between observers							Agreement (%)	K
Observers^a	Type 1	Type 2	Type 3	Type 4	Type 5	Type 6	Total	Agreement (%)	K
1-2	15	27	19	11	9	6	87	74.4	0.655
1-3	16	30	19	12	12	6	95	81.2	0.728
1-4	15	28	21	10	11	5	90	76.9	0.671
1-5	17	30	18	12	11	6	94	80.3	0.713
2-3	14	29	21	13	12	6	95	81.2	0.727
2-4	18	32	20	11	13	6	100	85.5	0.769
2-5	15	29	20	11	11	6	92	78.6	0.694
3-4	15	28	19	12	12	6	92	78.6	0.693
3-5	16	28	20	11	12	6	93	79.5	0.707
4-5	14	29	19	12	11	6	91	77.8	0.682
Overall	-	-	-	-	-	-	-	79.4	0.704

ISSN: 1749-799X