Table 3.
Demographics of the NCANDA Samples (N = 705) and corresponding p-values between the regular drinkers and minimal alcohol exposed cohort. The two cohorts happen to be properly matched (p > 0.1) with respect to all demographic factors but age (in years) and socioeconomic status, whose p-values are marked in bold. The statistic of the supratentorial volume is listed in cm3.
| Minimal | Regular | p-value | ||
|---|---|---|---|---|
| N = 671 | N = 34 | |||
| Age | mean | 15.7 | 19.5 | <0.0001 |
| standard deviation | 2.4 | 1.7 | ||
| Socioeconomic Status | mean | 16.7 | 18 | 0.0039 |
| standard deviation | 2.5 | 2.3 | ||
| Supratentorial Volume | mean | 1248.7 | 1236.4 | 0.5737 |
| standard deviation | 127.2 | 126.4 | ||
| Sex | Male | 333 | 16 | 0.7701 |
| Female | 338 | 18 | ||
| Ethnicity | N | 0.7398 | ||
| Caucasian | 492 | 25 | ||
| African-American | 86 | 6 | ||
| Asian | 54 | 3 | ||
| Pacific-Islander | 4 | 0 | ||
| Native-American | 3 | 0 | ||
| Mixed | 32 | 0 | ||
| Scanner | N | 0.4032 | ||
| GE | 447 | 25 | ||
| Siemens | 224 | 9 | ||