Box and whisker plots for skin surface pH at BL and following exposure to s-urine solutions. Significant increases in pH were observed at all skin sites, including the control (p = 0.038 for control, p = 0.001 for pH 5.0, p = 0.002 for pH 6.0, p = 0.008 for pH 7.0, p = 0.002 for pH 8.0, p = 0.004 for pH 9.0). No significant differences were found between the s-urine solutions (p = 0.302).