TABLE 3.

Mean value and standard deviation (SD) of decrease in apical diameter (mm) and the percentage of increase in all groups

Groups	Subgroup A (1 mo)		Subgroup B (2 mo)		Subgroup C (3 mo)		P‐value
	Mean	SD	Mean	SD	Mean	SD
Group I (blood clot)	0.37aA (6.5%)	0.02	0.50bA (9.1%)	0.07	0.82cA (27.8%)	0.11	≤.001*
Group II (EDTA + blood clot)	0.39aAB (7.1%)	0.03	0.57bA (10.4%)	0.10	0.91cB (29.1%)	0.09	≤.001*
Group III (PRF)	0.40aAB (8%)	0.06	0.68bB (14.1%)	0.08	0.98cB (35.1%)	0.11	≤.001*
Group IV (EDTA + PRF)	0.42aB (8.1%)	0.05	0.72bB (14.9%)	0.12	1.20cC (36.3%)	0.10	≤.001*
Group V (positive control)	0.00		0.00		0.00
Group VI (negative control)	0.83aC (13.2%)	0.09	1.20bC (22.1%)	0.11	1.40cD (38.2%)	0.05	≤.001*
P‐value	≤0.001*		≤0.001*		≤0.001*

The same upper‐case letters within each column indicate differences that were not significant.

The same lower‐case letters within each row indicate differences that were not significant.

Abbreviation: NS, not significant.

^*Significant at P ≤ .05.