Table 2.

Dental shade parameters repeatability analysis in Never Smokers

Parameters	7 days (short term) repeatability		30 days (long term) repeatability
	Regression analysis V2-V1 R value (p value)	Mean of the difference V2-V1 being different from zero? YES/NO (p value)	Regression analysis V3-V1 R-value (p value)	Mean of the difference V3-V1 being different from zero? YES/NO (p value)
L*	0.9287 (p = 0.0001)	NO (p = 0.080)	0.8673 (p = 0.0001)	NO (p = 0.169)
a*	0.9146 (p = 0.0001)	NO (p = 0.890)	0.8644 (p = 0.0001)	NO (p = 0.443)
b*	0.8690 (p = 0.0001)	NO (p = 0.233)	0.8633 (p = 0.0001)	YES (p = 0.004)
WID	0.9293 (p = 0.0001)	NO (p = 0.884)	0.8672 (p = 0.0001)	NO (p = 0.338)