Fig. 3

Least squares means (LSMs) of skin dirt removal rate by wiping using disposable towel. Notes: LSMs of removal rate for (A) oily dirt and (B) aqueous dirt by categories of wiping pressures or number of wipes (n = 50); In the digital image colour analysis, a dirt removal of rate ≥80% can be considered as a sufficient dirt removal. The circles indicate the LSMs as determined by a linear mixed model as a function of the combination of wiping pressure and number of wipes; The error bars indicate the 95% confidence interval; The wiping pressure (WP: mmHg) is classified into four categories represented by the numbers on the x-axis;1, 5≤WP<10; 2, 10≤WP<20; 3, 20≤WP<30; 4, 30≤WP<40