TABLE 1.
Sex | Pair type | Number of Complete Pairs | Number of Concordant Pairs | Number of Discordant Pairs | Tetrachoric Correlation | Standard Error | Prevalence of Drug Abuse (%)
|
|
---|---|---|---|---|---|---|---|---|
Male | Female | |||||||
Male-Male | Monozygotic twins | 3,899 | 47 | 122 | 0.79 | 0.03 | 2.8 | |
Male-Male | Dizygotic twins | 4,238 | 24 | 157 | 0.58 | 0.06 | 2.7 | |
Female-Female | Monozygotic twins | 4,558 | 20 | 98 | 0.70 | 0.05 | 1.5 | |
Female-Female | Dizygotic twins | 4,313 | 8 | 110 | 0.45 | 0.09 | 1.5 | |
Male-Female | Dizygotic twins | 12,447 | 45 | 663 | 0.36 | 0.05 | 4.0 | 2.1 |
Male-Male | Full siblings | 718,276 | 7,792 | 49,908 | 0.51 | 0.00 | 4.6 | |
Female-Female | Full siblings | 641,506 | 1,139 | 20,133 | 0.37 | 0.01 | 1.8 | |
Male-Female | Full siblings | 1,347,324 | 4,063 | 76,392 | 0.32 | 0.01 | 4.3 | 1.7 |
For full sibling pairs, we took all pairs within sibships up to four. With larger sibships, we picked four pairs at random.