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Mid-disk height of the intervertebral discs (A) in four groups (B).
Notes: Data were presented as mean ± SD and P<0.05 was considered statistically significant. *P<0.05 vs ND group; **P<0.05 vs DD group.
Abbreviations: BD, bulging discs; DD, degenerative discs; DHL1, disc height of L1/2; DHL2, disc height of L2/3; DHL3, disc height of L3/4; DHL4, disc height of L4/5; DHL5, disc height of L5/S1; HD, herniated discs; ND, normal discs.
