Table 3. The effect of coping thickness under the different cooling rates.

Cooling rate	Coping thickness	Coping thickness	Mean difference	Standard error	P	95% Confidence
						Lower limit	Upper limit
Conventional	0.5	1.5	−388.349	605.558	.525	−1616.478	839.780
	1.5	0.5	388.349	605.558	.525	839.780	1616.478
Slow	0.5	1.5	−3647.678	605.558	.001	−4875.807	−2419.549
	1.5	0.5	3647.678	605.558	.001	2419.549	4875.807