Quantitative anatomical analysis of lumbar interspaces based on 3D CT imaging: optimized segment selection for lumbar puncture in different age groups.

However, the efficacy ratio showed a decreasing trend from L3-4 to L5-S1, indicating that given successful insertion into the interlaminar space, the probability of effective dural puncture was highest at L3-4, followed by L4-5 and lowest at L5-S1.

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However, the risk ratio showed an increasing trend from L3-4 to L5-S1, signifying the highest injury probability at L5-S1, followed by L4-5, and lowest at L3-4 given insertion into the interlaminar space.

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