Table 2.

Pairwise comparison of compressive strength

Comparison groups	Mean difference in CS	P
Group I versus Group II	585±0.33	0.001*
Group I versus Group III	1468±0.68	0.001*
Group I versus Group IV	1098±0.24	0.001*
Group II versus Group III	883±0.34	0.001*
Group II versus Group IV	512±0.90	0.001*
Group III versus Group IV	−370±0.44	0.001*

*Significant difference at P≤0.05. CS: Compressive Strength