Table 3.

Linear correlations among peak days 2 and 3 and days 6 and 8, for all investigated anatomical districts, according to Pearson correlation coefficient.

—	ρ ∗	P value∗∗
Anterior palate (APA)
Day 2_day 6	0.73	<0.0001
Day 2_day 8	0.72	<0.0001
Day 3_day 6	0.83	<0.0001
Day 3_day 8	0.79	<0.0001
Posterior palate (PPA)
Day 2_day 6	0.74	<0.0001
Day 2_day 8	0.85	<0.0001
Day 3_day 6	0.79	<0.0001
Day 3_day 8	0.72	<0.0001
Joint area (JA)
Day 2_day 6	0.73	<0.0001
Day 2_day 8	0.77	<0.0001
Day 3_day 6	0.83	<0.0001
Day 3_day 8	0.78	<0.0001
Nasal area (NA)
Day 2_day 6	0.72	<0.0001
Day 2_day 8	0.74	<0.0001
Day 3_day 6	0.94	<0.0001
Day 3_day 8	0.76	<0.0001
Zygomatic area (ZA)
Day 2_day 6	0.85	<0.0001
Day 2_day 8	0.76	<0.0001
Day 3_day 6	0.83	<0.0001
Day 3_day 8	0.81	<0.0001

^∗ ρ, Pearson correlation coefficient; positive linear correlation for 0.72 < ρ < 0.94. ^∗∗P value <0.0001.