Table 1.

Statistical values of measured parameters in papillary dermis

Parameter	Regression equation	R2	F	P	Constant	b1	b2	b3
Thickness of papillary dermis (μm)	Linear	0.26	15.118	< 0.0001	63.238	0.361	–	–
Area fraction occupied by collagen bundles (%)	Quadratic	0.433	16.034	< 0.0001	67.9	0.2	−4.21 × 10−3	–
Thickness of collagen bundles (μm)	Quadratic	0.461	17.953	< 0.0001	1.096	−0.002	−2.486 × 10−5	–