Disc Height and Sagittal Alignment in Operated and Non-Operated Levels in the Lumbar Spine at Long-Term Follow-Up: A Case-Control Study

Table 4: Correlations Between Lumbar Levels for Disc Height and Sagittal Alignment

Correlation Between Levels for Disc Height	Spearman’s Rho (r)

L2/L3 vs L3/L4	0.61	p<0.001
L3/L4 vs L4/L5	0.41	p= 0.004
L4/L5 vs L5/S1	0.34	p=0.02

Correlation Between Levels for Sagittal Alignment

L2/L3 vs L3/L4	0.16	p=0.28
L3/L4 vs L4/L5	0.19	p=0.20
L4/L5 vs L5/S1	0.15	p=0.33