Established Rates, Unstudied Causes

This article addresses the most contested inference in the series, in two parts that should be read as separate propositions rather than a single argument.

What is established Established

The VA National Center for PTSD cites a study in which 33% of Vietnam-era veterans with PTSD reported past-year intimate partner violence, against 13.5% of those without — roughly three times the rate. A meta-analysis of 172,790 participants found similar elevation.

What is not established Unstudied

No study isolates anti-malarial neurotoxicity, as distinct from PTSD, as a driver of veteran-perpetrated domestic violence.

A reader may be tempted to complete a chain: quinoline injury resembles PTSD, PTSD is associated with violence, therefore quinoline injury is presumably associated with violence too. That reasoning is not valid — two conditions can share a symptom profile without sharing every associated outcome.

Holding both propositions

Elevated rates of violence in veteran households are established. Neurotoxic injury from these drugs is established. That both are true does not establish a relationship between them. No claim in the remaining articles rests on this link.