Table 4. Correlation and differences between the first and second measurements in control group.

Variable	Correlation			Paired difference
	n	r	p	Mean	p
ou-scv	40	0.848	<0.001	-0.003	0.842
ou-scm	40	0.290	0.069	0.490	0.001
od-scv	40	0.943	<0.001	-0.034	0.146
od-scm	40	0.664	<0.001	-0.073	0.531
odcd-scv	40	0.897	<0.001	-0.029	0.330
odcd-scm	40	0.511	0.001	0.025	0.839
odcs-scv	40	0.923	<0.001	-0.005	0.834
odcs-scm	40	0.487	0.001	0.073	0.669
os-scv	40	0.871	<0.001	-0.002	0.947
os-scm	40	0.572	<0.001	-0.002	0.982
oscs-scv	40	0.879	<0.001	0.037	0.207
oscs-scm	40	0.444	0.004	0.233	0.146
oscd-scv	40	0.798	<0.001	0.021	0.478
oscd-scm	40	0.635	<0.001	0.181	0.071