The study was limited to studying four generations: silent generation (b. 1928–1945), baby boomers (b. 1946–1964), generation X (b. 1965–1980) and the millennial generation (b. 1981–1996). Generation Z (b. 1997 - present) was not included because most relatives of probands who are in this generation are not yet adults and thus not past the riskiest developmental period for drinking. The greatest generation (b. 1927 and earlier, n = 79) was not included due to low numbers.
