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. 2020 Oct 31;7(3):331–334. doi: 10.1016/j.ijwd.2020.10.002

Table 1.

Comparison of biophysical parameters between lesion and control skin in patients with pityriasis rosea.

Parameter (units) Lesion, mean ± SD Control (mean of perilesional and symmetrical skin), mean ± SD p-value (paired t test)
Hydration (arbitrary) 46.30 ± 18.57 62.816 ± 16.22 <.001
TEWL (g/m2/h) 17.23 ± 10.65 8.88 ± 4.37 .001
Friction (arbitrary) 288.41 ± 237.05 376.827 ± 238.95 .075
pH (arbitrary) 6.30 ± 0.77 5.77 ± 0.71 <.001
Sebum (µg/cm2) 14.14 ± 29.89 9.55 ± 18.21 .398
Melanin content (arbitrary) 148.22 ± 43.52 144.68 ± 39.76 .700
Erythema index (arbitrary) 407.63 ± 73.49 219.618 ± 46.38 <.001
Temperature (centigrade) 31.43 ± 1.24 31.29 ± 1.02 .461
R0 (arbitrary) 0.26 ± 0.09 0.30 ± 0.08 .003
R2 (arbitrary) 0.67 ± 0.13 0.79 ± 0.09 .001
R5 (arbitrary) 0.39 ± 0.13 0.51 ± 0.17 .003

SD, standard deviation; TEWL, transepidermal water loss.