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Association of disc height with shape type of vacuum phenomenon. a Shape type analysis. The disc height index (DHI) in the island type group was significantly lower than that of the other groups. **P < 0.01. b Distribution analysis. The DHI tended to be lower in the areas including the anterior AF. **P < 0.01. VP: vacuum phenomenon; VP-: non-ruptured group; Nucleus pulposus: N; anterior annulus fibrosus: A; and posterior annulus fibrosus: P
