Table 1.

Frequencies and mean values of each global cluster from entire sample (N = 557) using K-means clustering procedure

				Univariate analysis for global angular measures
Cluster	1 Neutral 40.0 % (N = 223)	2 Sway-back 31.8 % (N = 177)	3 Leaning-forward 28.2 % (N = 157)
Pelvic displacement angle	2.8 ± 1.03 (0 to 4.8)	5.2 ± 1.33 (2.2 to 9.2)	6.2 ± 1.38 (3.9 to 10.8)	ANOVA: P < 0.001† Post hoc Bonferroni: P < 0.001†; Neu < SB < LF
Trunk lean angle	5.7 ± 1.75 (0 to 8.8)	10.2 ± 1.51 (7.6 to 15.2)	6.9 ± 1.77 (2.1 to 11.4)	ANOVA: P < 0.001† Post hoc Bonferroni: P < 0.001†; Neu < LF < SB
Body lean angle	8 ± 0.79 (−1.4 to 3.1)	1.4 ± 0.83 (−1 to 3.8)	−6 ± 0.71 (−3.4 to 6)	ANOVA: P < 0.001† Post hoc Bonferroni: P < 0.001†; LF < Neu < SB

Data are reported as [mean ± SD (range)]; all postural parameters in degrees (°)

For pelvic displacement angle, a greater value indicates more forward carriage of the pelvis relative to the feet; for trunk lean angle, a greater value indicates more backward inclination of the trunk with respect to the vertical; for body lean angle, a positive value indicates the vertical projection of the C7 spinous process to be posterior to the lateral malleolus, whereas a negative value indicates the vertical projection of the C7 spinous process to be anterior to the lateral malleolus

Neu neutral, SB sway-back, LF leaning-forward

^† P < 0.05