Table 1.

Tobacco packaging visual elements index system.

Target Layer	Indicator Layer	Index Layer	Reference Sources
Visual elements of tobacco packaging that influence risk perception	B: Brand Image	B1: Complete Brand Image B2: Restrict brand image B3: No brand image	Hammond, D., et al. (2009) [36]
	P: Packaging box color	P1: Solid color base color P2: Color Base P3: Colorless base color	Hammond, D., et al. (2009) [37] Lempert, L.K., et al. (2017) [38] Fong, G.T., et al. (2009) [39]
	H: Health warning logo style	H1: Text health warning logo H2: Image Health Warning Logo H3: No health warning label	Barrientos-Gutierrez, I., et al. (2021) [23] Grilo, G., et al. (2021) [24]
	W: Health warning label ratio	W1: The proportion of 30% W2: Proportional share of 50% W3: The proportion is 75%	Germain, D., et al. (2010) [9] Mercincavage, M., et al. (2021) [26] Pepper, J.K., et al. (2013) [40]