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

Table 3 Agreement analysis by slip grade of SDSG classification

Slip grade	Inter-observer reliability		Intra-observer reproducibility
Slip grade	Agreement (%)	K	Agreement (%)	K
All cases	89.2%	0.813	90.4%	0.873
Low-grade slips	85.3%	0.729	89.5%	0.852
High-grade slips	91.2%	0.864	92.7%	0.911