18-35 years

36-50 years

50-70 years

Mean

SD

Mean

SD

Mean

SD

P (Gender)

P (Age)

Vermillion of the upper lip

4.6

1.0

3.6

0.2

3.1

0.6

0.78

0.01^*

Vermillion of the lower lip

4.5

0.6

3.4

0.9

3.0

1.2

0.34

0.01^*

Nasolabial angle

111.2

9.7

110.2

12.8

109.6

6.5

0.03^*

0.87

Mentolabial angle

131.2

17.2

144.3

9.4

157.1

20.8

0.21

0.02^*

Lip width

45.5

3.3

48.6

5.2

50.5

4.1

0.11

0.16

Upper lip vermilion height

8.0

0.7

6.7

1.4

5.6

1.0

0.79

0.0001^**

Lower lip vermilion height

10

2.0

7.6

2.0

5.9

2.1

0.24

0.002^**