Table 4.

LSD test between all studies groups of hardness test.

Study groups		Mean difference	SE	Sig.
Group (A)	Group (B)	1.455	0.316	0.000 HS
Group (B)	Group (C)	−0.290	0.316	0.367 NS
Group (C)	Group (A)	−1.165	0.316	0.001 HS