Table 2. Comparisons of Thongprasom levels with intragroup and intergroup.

		i-PRF Group	Corticosteroid Group	p1
		Mean±SD	Mean±SD
		Med (Min-Max)	Med (Min-Max)
Thongprasom	Baseline	4.79±0.41	4.71±0.46	0.509
		5 (4-5)	5 (4-5)
	1st month	1.88±1.3a	2±1.41a	0.720
		1 (0-5)	2 (0-5)
	2nd month	1.58±0.83a	1.88±1.23a	0.475
		1 (0-3)	1.5 (0-5)
	6th month	1.88±1.08a	2.21±1.35a	0.441
		1.5 (1-5)	2 (1-5)
p*		<0.001	<0.001

*Friedman test p-value (intragroup); statistical significance (p<0.05) marked in bold.

1Mann-Whitney U test p-value (intergroup).

a Statistical significance compare to baseline, using the Wilcoxon test with Bonferroni-correction (p<0.008).

Abbreviations: VAS, visual analog scale; i-PRF, injectable platelet-rich fibrin; SD, standard deviation; Med, median; Min, minimum; Max, maximum.