Characteristics of the female TwinsUK samples.

Demographic characteristics of the discovery (27 k DNA methylation bead chip), replication (450 k DNA methylation bead chip) and validation (methylated DNA immunoprecipitation and high throughput sequencing (MeDIPseq) samples are listed. Samples zygosity is shown (monozygotic (MZ) and dizygotic (DZ) twins) as well as unpaired twins (singletons). Demographic measures include number of subjects (n), mean chronological age at DNA extraction in years and age range, as well as mean chronological age at hearing assessment in years. Mean and standard deviation (sd) of hearing principal component 1 (PC1), representing the overall threshold shift in the audiogram, are given. Characteristics of the female TwinsUK samples.