Table 1.

Comparison of mean marginal discrepancy of polyetheretherketone and zirconia copings using student (independent) t-test

Group	n	Mean	SD	SEM	Mean difference	t	P
PEEK	15	92.840	3.48109	0.89881	29.72	3.635	0.001*
Zirconia	15	63.120	31.47761	8.12748

*The mean difference is significant at the 0.05 level. SD: Standard deviation, SEM: Standard error of mean, PEEK: Polyetheretherketone