From zero adverse childhood experiences to six, suicidal thinking went from 6% to 41%

In 1,850 nineteen-year-olds, rates of depression, PTSD and suicidal ideation climbed step by step with the number of adverse childhood experiences, and discrimination was one of the four domains carrying most of the weight.

Most of what is known about adverse childhood experiences comes from adults being asked to remember their childhoods, using a checklist that leaves out anything happening outside the home. Researchers led by Jeff Temple did it differently, following a population-based sample recruited from urban and suburban schools in the southern US and analysing 1,850 participants with complete data at around age 19. They counted conventional adversities and community-level ones such as discrimination and neighbourhood violence, then grouped people by exposure: none, one to three, four to five, six or more. The associations are graded, meaning each step up carried more harm rather than everything appearing at a single threshold. Depression: 21.0% among those with no adverse experiences, 46.5% at four to five, 56.9% at six or more. PTSD: 2.1%, then 15.2%, then 30.9%. Suicidal ideation: 6.0%, then 27.8%, then 41.4%. Illicit substance use rose from 0.3% to 10.8%, and experiencing physical dating violence from 2.7% to 14.9%. Academic achievement and college attendance fell as exposure rose. Ten of the fourteen adversity domains were independently associated with key outcomes, and the four that showed up most consistently were emotional abuse, sexual abuse, witnessing domestic violence, and discrimination. That last one is the argument for widening the standard checklist. The limits are real: exposures were reported at the same wave as several outcomes, so this is association rather than causation, and a single southern US sample is not the country. But the pattern is a dose-response one, measured near the time rather than recalled decades later.