Adjusting US homicide rates for improvements in trauma care, 1900–2020. Using abdominal gunshot wound survival as a proxy for medical capability, how much violence has improving medicine hidden?
Anchor points for abdominal GSW mortality (civilian): ~72% (1900, extrapolated from military data — Civil War 87%, Spanish-American ~79%, early civilian laparotomy series); ~65% (1918, WWI-era, pre-antibiotics); ~45% (1945, post-penicillin + blood banking); ~35% (1955, Hill-Burton hospital proliferation); ~30% (1960, pre-EMS/trauma systems); ~25% (1970, 911 introduced 1968); ~18% (1980, trauma center era); ~14% (1990, damage-control surgery emerging); ~12% (2000, mature systems); ~9% (2010, FAST ultrasound, massive transfusion protocols); ~8% (2020, state of the art).
Adjustment formula: adjusted(t) = observed(t) × abd_mort(1900) / abd_mort(t). This asks: "if gunshot victims at time t died at the same rate as in 1900, how high would the homicide rate be?" This is an upper bound on the true adjustment because not all homicide victims are medically saveable — head shots (~11% of assault GSWs, ~90% fatal regardless of era) and DOA cases are essentially invariant. The true adjustment is probably 60–80% of the displayed values for recent decades.
Other limitations: (1) Pre-1960 anchor points are from scattered clinical series and military data, not systematic civilian surveillance. (2) 1900–1910 homicide rates are from "registration states" only and undercount the violent South — the early observed rates are too low. (3) Weapon characteristics (caliber, velocity) changed over time. (4) Linear interpolation between sparse anchors is crude. This chart is illustrative, not definitive.
The Council on Criminal Justice (2025) documents that after decades of declining lethality, the trend reversed sharply starting ~2014. By 2020, assaults were 3.6× deadlier than in 1994. This means the simple "medicine keeps getting better, so homicides keep getting more suppressed" story broke down. Possible drivers: higher-caliber weapons becoming standard, larger magazine capacities, multiple-wound incidents, geographic shifts in violence away from trauma centers, and deteriorating response times in high-crime areas.
Harris et al. (2002), "Murder and Medicine": The foundational study. Firearm-specific lethality dropped 65% from 1964 (15.5%) to 1999 (5.4%). Only 1.2% of the overall lethality decline was attributable to weapon mix shifts; 98.8% was genuine within-weapon improvement. Motor vehicle crash lethality dropped 67% over the same period — nearly identical, supporting the medical explanation. Counties with hospitals had 11–24% lower lethality; regionalized trauma systems added 16% further reduction.
Giacopassi et al. (1992), Memphis study: The only study reaching back before 1960. Memphis police homicide files at 25-year intervals: 1935 lethality 11.4%, 1960 lethality 5.5%, 1985 lethality 3.2%. The 1935→1960 drop (~2×) is driven by penicillin, blood banking, and hospital proliferation.
Why gunshot hospitalizations don't solve it cleanly: CDC explicitly warns against using NEISS-AIP for firearm injury prevalence due to small, geographically unrepresentative hospital samples. Nonfatal data starts only 2001 (partially 1993). The best available proxy remains weapon-specific lethality ratios supplemented by clinical case fatality studies.
Cook (2017) / Lauritsen (2015) critique: Part of the aggravated assault increase may reflect expanded reporting, not actual violence. This would inflate assault-based denominators and overstate lethality decline. The abdominal GSW survival approach in Chart 3 sidesteps this entirely — it uses clinical mortality, not crime reporting.
The adjusted line in Chart 3 suggests that serious violence roughly tripled between 1960 and 1980, and has remained at that elevated plateau ever since. The "great crime decline" of the 1990s–2000s was substantially a story about trauma medicine getting better, not about society getting safer. The raw homicide drop from ~10 per 100k (1980) to ~4.4 (2014) corresponds to an adjusted drop from ~41 to ~34 — real, but far less dramatic than the ~60% decline the raw numbers suggest.
The pre-1960 picture is murkier due to data limitations, but the Prohibition-era peak (~9.7 observed, ~15.5 adjusted) and postwar trough (~4.1 observed, ~8.4 adjusted) were both substantially higher in "true violence" terms than their raw rates suggest. The postwar "golden age of safety" was partly real pacification (end of Prohibition, prosperity) and partly penicillin arriving just in time.