Table 1.
Descriptive statistics for Finnish Twin Study (FinnTwin12).
| Males (n = 551) |
Females (n = 650) |
Full Sample (n = 1201) |
|||||
|---|---|---|---|---|---|---|---|
| Mean/n | SD/% | Mean/n | SD/% | Mean/n | SD/% | χ2/t-test | |
| Drinking frequency | 5.10 | 4.54 | 3.43 | 3.24 | 4.20 | 3.98 | * |
| Intoxication frequency | 2.02 | 1.97 | 1.12 | 1.44 | 1.54 | 1.76 | * |
| DSM-IV alcohol dependence symptoms | 1.54 | 1.35 | 1.29 | 1.37 | 1.40 | 1.37 | * |
| GPSa | −0.03 | 1.02 | 0.03 | 0.98 | 0.00 | 1.00 | |
| Age | 21.94 | 0.77 | 21.95 | 0.76 | 21.94 | 0.77 | |
| Educational attainment | * | ||||||
| Basic education | 38 | 6.9% | 30 | 4.6% | 68 | 5.7% | |
| Vocational training | 207 | 37.6% | 157 | 24.2% | 364 | 30.3% | |
| Secondary education | 299 | 54.3% | 424 | 65.2% | 723 | 60.2% | |
| Tertiary education | 7 | 1.3% | 39 | 6.0% | 46 | 3.8% | |
| Enrolled in school | 285 | 51.7% | 401 | 61.7% | 686 | 57.1% | * |
| In relationship | 269 | 48.8% | 416 | 64.0% | 685 | 57.0% | * |
*
P < 0.05 for χ2/t-test difference between males and females.
a
Standardized (Z-scores) genome-wide polygenic scores (GPS) including single nucleotide polymorphisms (SNPs) with P < 0.50. SD = standard deviation.