Table 2.

Means, SD and ranges of the measurements for spino-pelvic alignments

Measurementa	Mean (range)	SD	Correlation*
PR (mm)	123 (104–144)	8.2	0.9831
PR-S1	37.4 (18–63)	9.5	0.9908
PA	19.5 (7–36)	5.5	0.9815
HA-S1 (mm)	40.8 (14–68)	11.0	0.9951
PR-T12	92.4 (75–114)	8.2	0.9687
T12-S1	54.7 (30–76)	9.9	0.9921
PR-L2	86.7 (70–110)	7.9	0.9891
PR-L4	71.4 (48–89)	9.0	0.9904
PR-L5	57.7 (30–82)	10.5	0.9952

The values shown in the table refer to the value from observer 1

^aAll parameters were measure in degree except for PR and HA-S1 was measure in millimeters. See Table 1 and Fig. 2 for abbreviations and descriptions of measurement

* Person correlation between two observers, P value < 0.0001