Measure
Nulliparous (Mean ± std)
Pregnant (Mean ± std) Parous (Mean ± std) ANOVA p-value
BH CV
Coccygeal Curvature Index 78.7 ± 6.6 89.2 ± 10.0 80.0 ± 5.5 0.001* 0.007
Sacrococcygeal Angle (°) 92.8 ± 10.9 109.3 ± 9.4 101.9 ± 11.0 0.002* 0.017
Sacrococcygeal Curvature Index 73.3 ± 5.8 79.2 ± 3.7 77.6 ± 5.4 0.016* 0.025
Coccygeal Straight Length (cm)
3.2 ± 0.5
3.7 ± 0.8
3.2 ± 0.5
0.046
0.033
Sacral Curvature Index
90.7 ± 6.6
89.2 ± 3.6
92.6 ± 4.6
0.120
0.042
Sacrococcygeal Straight Length (cm)
11.4 ± 1.2
12.3 ± 0.9
11.9 ± 1.2
0.212
0.050
Sacral Straight Length (cm)
10.8 ± 0.8
10.5 ± 1.0
10.7 ± 0.9
0.586
0.058
Sacral Curved Length (cm)
12.0 ± 0.8
11.8 ± 0.9
11.7 ± 0.8
0.618
0.067
Sacrococcygeal Curved Length (cm)
15.6 ± 1.0
15.5 ± 1.4
15.4 ± 1.1
0.735
0.075
Coccygeal Vertebrae
3.5 ± 0.7
3.4 ± 0.5
3.5 ± 0.6
0.760
0.073
Coccygeal Curved Length (cm)
4.1 ± 0.6
4.2 ± 0.8
4.1 ± 0.6
0.832
0.092
Coccygeal Angle (°)
126.3 ± 17.2
132.4 ± 21.9
133.9 ± 14.5
0.920
0.100