Table 3.

Mean compression strengths of the Copal subgroups in MPa, including standard deviation (SD), standard error (SE) and 95% confidence interval (CI) of the mean and range

	Mean	SD	SE	95% CI		Range
COP0%	86,268	2,549	0,806	84,444	88,092	82,231	90,217
COP2.5%	76,589	3,988	1,261	73,736	79,443	70,440	83,210
COP5%	78,917	2,862	0,905	76,869	80,964	74,000	83,366
COP10%	71,188	3,433	1,085	68,732	73,644	65,540	76,386