Table-I.

Mean and standard deviations for CIELab values and ΔE at 95% confidence interval among ceramic study groups.

Ceramic Study groups	ΔL* Mean (SD)	Δa* Mean (SD)	Δb* Mean (SD)	ΔE* Mean (SD)
Cigarette smoke (CS)	-2.108 (0.628)	0.331 (0.174)	1.12 (0.493)	2.422 (0.771) A
E-cigarette smoke (ENDS)	-2.067 (0.389)	-0.579 (0.263)	1.137 (0.398)	2.396 (0.596) A
No Smoke (NS)	-0.111 (0.347)	0.027 (0.032)	0.025 (0.073)	0.291 (0.23) B

Dissimilar superscript alphabets for ΔE indicate statistical significance, SD. Standard deviation. ΔE values: NS < ECS = CS.