Genetic associations and shared environmental effects on the skin microbiome of Korean twins

BMC Genomics

Table. 1 Summary of the study population (N = 45)

	Mother	MZ twin	DZ twin	Singleton^a	Sum
No.	16	16	8	5	45
Age, mean (SD), y	62.1 (8.5)	31.0 (3.6)	36.8 (5.1)	41.2 (8.4)
Sex
Female, no.	16	10	4	3	33
Male, no.	-	6	4	2	12
Humidity (SD), AU^bc	30.1 (20.6)	36.3 (29.3)	19.0 (21.3)	28.7 (17.3)
Pigmentation (SD), AU^bd	124.3 (83.4)	97.9 (72.3)	65.6 (73.1)	111.6 (64.8)

^aThree MZ and two DZ twins were analyzed as singletons, since one of their associated twins was excluded due to antibiotic use
^bDermatologic phenotypes were measured from 12 mothers, 15 MZ twins, and 5 DZ twins
^cThe level of skin humidity is expressed using arbitrary units (AU) as given by the device (Corneometer®CM825). Corneometry values greater than 45 AU indicate sufficiently moisturized skin, while values less than 45 AU indicate dry skin
^dA melanin index of 0–150 AU indicates light skin tone, and values of 150–250 AU indicate mid-tone skin pigmentation

ISSN: 1471-2164