Table 1.
Description of the TwinsUK discovery sample
| Full dataseta | Microbiome subsetb | |
|---|---|---|
| No. of samples | 3666 | 1313 |
| Sex | ||
| Female | 3296 | 1266 |
| Male | 370 | 47 |
| Zygosity | ||
| MZ | 2088 | 496 |
| DZ | 1578 | 594 |
| Unrelated | 0 | 223 |
| Age (mean (range)) | 63 (32–87) | 63 (32–87) |
| BMI (mean (range)) | 26.1 (15.7–49.9) | 26.1 (16.2–45.9) |
| Ethnicity | ||
| European | 3511 | 1295 |
| Other | 102 | 9 |
| Unknown | 53 | 8 |
aSummaries are shown for both the extended dataset of 3666 twins used in the phenotype heritability analyses and for the microbiome sample subset of 1313 individuals. bAdditional file 1: Table S7 includes extended descriptions of the microbiome data subset