No wrinkle: no visible wrinkle, continuous skin line
Very shallow yet visible wrinkle
Fine wrinkle: visible wrinkle and slight indentation
Visible wrinkle and clear indentation, <1 mm wrinkle depth
Moderate wrinkle: clear visible wrinkle 1-2 mm wrinkle
Prominent and visible wrinkle: more than 2 mm and less than 3 mm wrinkle depth
Deep wrinkle: deep and furrow wrinkle; more than 3 mm wrinkle depth
As outlined in . Wrinkle depth is based on assessors’ estimation rather than physical measurement.
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