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Table 2 Results of intra- and inter-observer reliability test

From: The effect of age on sagittal plane profile of the lumbar spine according to standing, supine, and various sitting positions

Posture Intra-observer reliability* Inter-observer reliability*
Standing 0.97 0.89
  30° 0.98 0.91
  60° 0.96 0.88
  90° 0.96 0.88
Supine 0.97 0.90
  1. *The intra- and inter-observer reliability was tested using the intraclass coefficient (ICC) test with a set-up of a two-way-mixed and absolute agreement. The values of the ICC test more than 0.8 could be thought to be strongly reliable.