Table 1.

Pearson correlation coefficients between the five points of time.

	GR1	GR2	GR3	GR4
GR2	0.975
GR3	0.970	0.947
GR4	0.975	0.964	0.941
GR5	0.943	0.882	0.940	0.928

GR corresponds to the time point, from 1 to 5. In all cases, p < 0.01.