Table 6.

Results of the Post Hoc Test.

Posthoc test	Variable	Groups		Mean difference	Standard error	p
Tukey's test	External DKS	30–40 years	40–50 years	−0.36	0.22	0.23
		40–50 years	50–60 years	−0.60	0.23	< 0.05

Note. *p < 0.05.