Table 1 Trend lines for the dependencies of skin roughness parameters on the age difference (x = BA – CA) for male and female participants

Female

y = 48.80e^–0.83x, R² = 0.209

y = 565.2e^–0.62x, R² = 0.160

y = 725.9e^–0.83x, R² = 0.384

y = 237.5e^–0.29x, R² = 0.060

y = 282.3e^–0.57x, R² = 0.209

y = 0.181e^–0.43x, R² = 0.377

Male

y = 74.69e^–0.99x, R² = 0.555

y = 74.69e^–0.99x, R² = 0.555

y = 494.6e^–0.60x, R² = 0.134

y = 321.4e^–0.45x, R² = 0.314

y = 371.4e^–0.76x, R² = 0.388

y = 0.255e^–0.42x, R² = 0.395