Table 3.

Differences in mean a* among study groups

Groups	Room temperature	High temperature	a p
	Mean a* ± SD	Mean a* ± SD
Control group	2.15 ± 0.31	2.30 ± 0.41	0.118
White	2.41 ± 0.42	1.77 ± 0.41	<0.001*
Blue	2.33 ± 0.31	1.96 ± 0.46	<0.001*
Yellow	2.09 ± 0.44	1.81 ± 0.49	0.027*
Green	2.23 ± 0.37	1.29 ± 0.34	<0.001*
Reddish-brown	3.83 ± 0.64	3.56 ± 0.70	0.123

^aIndependent samples t test

*p < 0.05