Table A2. Constraint axes optima for segment and joint angles.

	Segment angles				Joint angles
	S1	L1	T6	T1	Lumbar	Lw thoracic	Upp thoracic
Constraint n°	1	4	4	3	19	17	3
Constraint axis	${\hat{z}}_{-2}$	$\hat{z}$	$\hat{z}$	$\hat{h}$	$\hat{z}$-$\hat{z}$	$\hat{z}$-${\hat{z}}_{-1}$	${\hat{z}}_{-2}$-$\hat{h}$
Mean	0.3°	0.7°	1.6°	1.7°	2.9°	1.6°	2.2°
SD	0.3°	0.7°	1.4°	0.9°	2.3°	1.5°	1.6°

Note:

Constraint number and associated axis are shown with mean and standard deviation of ROM measurement error absolute values.