Table 4. Comparison between groups for evaluation of compressive strength.

p-value was derived by one way ANOVA

Group	n	Mean ± SD	95 % Confidence interval		p-value
			Lower	Upper
Group 1	12	174.4±1.80	173.3	175.6	0.565
Group 2	12	172.9±2.6	171.3	174.4
Group 3	12	173.15±3.09	171.1	175.1
Group 4	12	173.29±2.50	171.6	174.8
Group 5	12	172.63±2.14	171.2	173.9
Group 6	12	173.70±2.11	172.3	175.0
Control	12	173.65±2.04	172.3	174.9