Table 1.

Modified Fitzpatrick Wrinkle Scale grade definitions^*.

Grade	Definition
0	No wrinkle: no visible wrinkle, continuous skin line
0.5	Very shallow yet visible wrinkle
1	Fine wrinkle: visible wrinkle and slight indentation
1.5	Visible wrinkle and clear indentation, <1 mm wrinkle depth
2	Moderate wrinkle: clear visible wrinkle 1-2 mm wrinkle
2.5	Prominent and visible wrinkle: more than 2 mm and less than 3 mm wrinkle depth
3	Deep wrinkle: deep and furrow wrinkle; more than 3 mm wrinkle depth

^*As outlined in [18]. Wrinkle depth is based on assessors' estimation rather than physical measurement.