Progress in Orthodontics

Table 3 Photograph ratings by age group of altered gingival display

From: Perception of smile esthetics by laypeople of different ages

Gingival display (mm)	Age groups						p value
	15–29 years old			36–52 years old
	Mean	SD	Result^a	Mean	SD	Result^a
Image 1 (−4)	2.93	1.67	A	5.90	1.96	A	0.000**
Image 2 (−2)	3.86	1.38	B	5.89	1.80	A	0.000**
Image 3 (0)	6.88	1.42	C	5.81	1.61	A	0.000**
Image 4 (+2)	7.40	1.36	C	5.78	1.59	A	0.000**
Image 5 (+4)	4.74	1.71	B	4.64	1.46	B	0.532 NS
Image 6 (+6)	2.98	1.96	A	2.94	1.49	C	0.882 NS

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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