Table 4.

Comparison of degree of change of cervical alignment between <50 and ≥50 years

		Aged <50 yr (n=25)	Aged ≥50 yr (n=22)	p-valuea)
Four-line Cobb’s angle (º)	Before exercise	0.49±8.42	-1.70±11.78	0.463
	After exercise	-4.18±11.14	-4.09±11.29	0.977
	p-valueb)	0.002	0.109
	Change	-4.67±6.91	-2.39±6.70	0.258
Posterior tangent method (º)	Before exercise	-4.86±9.01	-5.21±9.46	0.900
	After exercise	-9.26±11.32	-8.50±10.49	0.815
	p-valueb)	0.005	0.034
	Change	-4.39±7.15	-3.30±6.81	0.595
SVA (mm)	Before exercise	16.78±10.41	21.77±11.99	0.134
	After exercise	11.17±11.57	20.62±14.56	0.017
	p-valueb)	<0.001	0.357
	Change	-5.62±6.96	-1.14±5.68	0.021

Values are presented as mean±standard deviation.

SVA, sagittal vertical axis.

^a)Intergroup comparison,

^b)before and after exercise intragroup comparison.