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Table 1: Mean (±SD) initial signal-intensity and degeneration grades and changes in them by annular tear for all disks and by disk level
Disk Annular Tear? Initial Signal-Intensity Grade Initial Degeneration Grade Change in Signal Intensity Change in Degeneration
All No 1.43 ± 0.62 2.20 ± 0.40 0.15 ± 0.54 0.15 ± 0.39
Yes 3.07 ± 1.31 3.24 ± 0.94 0.42 ± 0.85 0.31 ± 0.37
T12-L1 No 1.50 ± 0.50 2.19 ± 0.40 0.11 ± 0.43 0.23 ± 0.42
Yes 2.60 ± 1.42 2.90 ± 1.02 0.40 ± 0.88 0.30 ± 0.57
L1–2 No 1.27 ± 0.57 2.22 ± 0.43 0.27 ± 0.43 0.05 ± 0.23
Yes 2.87 ± 1.2 3.14 ± 0.93 0.46 ± 0.79 0.25 ± 0.51
L2–3 No 1.53 ± 0.90 2.20 ± 0.41 0.06 ± 0.70 0.13 ± 0.56
Yes 2.90 ± 1.16 3.16 ± 1.00 0.38 ± 0.80 0.32 ± 0.59
L3–4 No 1.50 ± 0.52 2.30 ± 0.48 0.20 ± 0.63 0.10 ± 0.41
Yes 3.25 ± 1.33 3.30 ± 0.85 0.33 ± 0.92 0.41 ± 0.55
L4–5 No 1.00 ± 0.00 2.00 ± 0.00 0.50 ± 0.70 0.50 ± 0.72
Yes 3.25 ± 1.31 3.36 ± 0.96 0.40 ± 0.87 0.25 ± 0.57
L5-S1 No 1.50 ± 0.70 2.00 ± 0.00 -0.50 ± 0.90 0.00 ± 0.00
Yes 3.22 ± 1.37 3.34 ± 0.91 0.56 ± 0.87 0.34 ± 0.64