Progress in Orthodontics

Table 4 Photograph ratings by age group of altered black triangles

From: Perception of smile esthetics by laypeople of different ages

Black triangle (mm)	Age groups						p value
	15–29 years old			36–52 years old
	Mean	SD	Result^a	Mean	SD	Result^a
Image 1 (0)	7.05	2.23	A	7.24	1.79	A	0.805 NS
Image 2 (0.5)	5.53	2.46	B	6.13	1.86	B	0.058 NS
Image 3 (1)	4.59	2.22	C	5.36	1.89	C	0.002**
Image 4 (1.5)	4.28	2.22	C	5.02	2.00	C	0.002**
Image 5 (2)	3.38	2.25	D	4.32	2.00	D	0.000**
Image 6 (2.5)	2.98	2.26	D	3.87	2.07	D	0.001**

NS not significant
^**Statistical differences between age groups (p < 0.05)
^aIn each age group, scores of the images with the same letter were not significantly different

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