Table 4.

The characteristics (classification) of the lumbar lordosis according to the PR-S1 angle

Parametersa	Low PR-S1	Average PR-S1b	High PR-S1
	PR-S1 < 35°	PR-S1 ~ 35–45°	PR-S1 > 45°
T12-S1	61.6 ± 8.0**	53.9 ± 7.7	45.9 ± 8.5*
PR-L2	82.1 ± 7.4	87.8 ± 6.8	91.5 ± 7.1
PR-L4	64.1 ± 8.4*	73.2 ± 6.1	78.9 ± 6.2
PR-L5	48.5 ± 9.7*	59.3 ± 6.4	68.0 ± 5.7**

Data show means value (in degree) ± SD

^aSee Table 1 and Fig. 2 for abbreviations and descriptions of measurement

^bAverage values of PR-S1 angle was derived from median values with 10˚ range

* Significant reduction with P < 0.05; ** significant increase with P < 0.05 (one way ANOVAs)