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Table 2 Inter-observer analysis of radiographic measurements. Intraclass correlation coefficient with good (> 0.75) or excellent (> 0.90) reproducibility. CI = Confidence Interval

From: Low lordosis is a common finding in young lumbar disc herniation patients

Measurements

Intraclass correlation

95% CI

p-value

Pre-operative measurements

 Sacral slope

0.86

0.64–0.95

< 0.001

 Pelvic incidence

0.75

0.64–0.91

< 0.001

 Pelvic tilt

0.89

0.73–0.96

< 0.001

 Lumbar lordosis

0.94

0.79–0.97

< 0.001

 Pelvic incidence – Lumbar lordosis

0.93

0.83–0.98

< 0.001

Post-operative measurements

 Sacral slope

0.76

0.64–0.95

< 0.001

 Pelvic incidence

0.82

0.54–0.94

< 0.001

 Pelvic tilt

0.93

0.79–0.97

< 0.001

 Lumbar lordosis

0.9

0.72–0.96

< 0.001

 Pelvic incidence – Lumbar lordosis

0.95

0.87–0.98

< 0.001