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Table 6 Correlations (r) between Lordosis and PI for each group

From: Correlation between lumbar intervertebral disc height and lumbar spine sagittal alignment among asymptomatic Asian young adults

Roussouly types Level r p
Type I L1–L2 0.4034 0.0521*
L2–L3 0.4183 0.0325
L3–L4 0.4978 0.0032
L4–L5 0.5027 0.0195
L5–S1 0.5321 < 0.0001
Type II L1–L2 0.4327 0.0027
L2–L3 0.4856 0.0019
L3–L4 0.5154 0.0002
L4–L5 0.5360 0.0002
L5–S1 0.4859 0.0018
Type III L1–L2 0.5017 < 0.0001
L2–L3 0.5483 < 0.0001
L3–L4 0.4892 < 0.0001
L4–L5 0.6098 < 0.0001
L5–S1 0.5709 < 0.0001
Type IV L1–L2 0.4311 0.0527*
L2–L3 0.5828 0.0078
L3–L4 0.8619 < 0.0001
L4–L5 0.8456 < 0.0001
L5–S1 0.7389 <  0.0001
  1. *There was no statistically significant correlation (p > 0.05)