Table 4.

Result of simple linear regression analyses among the measured parameters and age

Parameters	Decision coefficient (r 2)	P‐value	Slope of the regression line	Intercept of the regression
CBVAa	0.0058	0.3910	−0.0400	6.9720
SLSb	0.0069	0.3388	−0.0441	2.4807
McGSc	0.0095	0.2598	−0.0532	5.9153
CLd	0.1058	0.0001	0.3225	−15.9544
Kyphe	0.0457	0.0125	0.1918	34.1563
LLf	0.0093	0.2631	−0.0968	59.3261
SSg	0.0004	0.8218	−0.0148	41.3323
PTh	0.0945	0.0003	0.2085	3.0202
PIi	0.0385	0.0220	0.1936	44.3585
PThj	0.0068	0.3381	−0.0054	11.1312
SVAk	0.1368	<0.0001	0.0781	−3.0971
TPAl	0.0562	0.0055	0.1797	8.2725
APFm	0.0394	0.0206	0.1430	191.0203
KneeFlexn	0.0621	0.0034	0.1008	−5.5798
AnkleFlexo	0.0341	0.0313	0.0384	2.4860

^aThe chin–brow vertical angle (CBVA).

^bThe slope of the line of sight (SLS).

^cMcGregor slope (McGS; Lafage et al. 2016).

^dC2–C7 lordosis (CL).

^eT1–T12 kyphosis (kyph).

^fL1–S1 lumbar lordosis (LL).

^gSacral slope (SS).

^hPelvic tilt (PT).

ⁱPelvic incidence (PI; Duval‐Beaupère et al. 1992; Legaye et al. 1998).

^jPelvic thickness (PTh; Le Huec et al. 2011).

^kThe offset between the vertical line through the posterior edge of the base of the sacrum and the centre of the vertebral body of C7 (Roussouly et al. 2006; Schwab et al. 2013).

^lThe sum of the PT and the angle between the plumb line from the hip axis (HA; Protopsaltis et al. 2014).

^mHip joint extension determined using the angle pelvi‐femoral (APF; Mangione & Senegas, 1997).

ⁿThe mean of the bilateral knee flexion angles.

^oThe ankle dorsiflexion angle measured between the line from the notch to the midpoint of the distal tibial joint surfaces and the plumb line from the midpoint.