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Table 1 The inter-and intra-observer variation for classification of MA-LSTV types by both AP-LPR method and CT method

From: Lumbar plain radiograph is not reliable to identify lumbosacral transitional vertebra types according to Castellvi classification principle

Reading

Kappa (95% conf. limit)

LPR

CT

First inter-observer variation

0.893 (0.855–0.931)

0.921 (0.887–0.955)

Second inter-observer variation

0.880 (0.840–0.920)

0.874 (0.832–0.916)

intra-observer variation of observer 1

0.955 (0.929–0.981)

0.969 (0.947–0.991)

intra-observer variation of observer 2

0.939 (0.910–0.968)

0.952 (0.925–0.979)