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Table 2 Unadjusted associations of purchaser and indexa purchase characteristics with firearm suicide among those aged 21–25 and 50–54 in 1996

From: Handgun purchasing characteristics and firearm suicide risk: a nested case–control study

  Purchasers aged 21–25 in 1996 Purchasers aged 50–54 in 1996
IRR (95% CI) IRR (95% CI)
Characteristics of individuals
Age at first purchaseb in years 1.08 (1.05, 1.11) 1.06 (1.04, 1.08)
Race/ethnicity
 Asian 0.96 (0.67, 1.37) 0.56 (0.31, 1.01)
 Black/African American 0.86 (0.53, 1.40) 0.66 (0.37, 1.17)
 Hispanic/Latinx 0.68 (0.50, 0.92) 0.57 (0.33, 0.97)
 Otherc 0.70 (0.36, 1.36) 0.88 (0.51, 1.52)
 White (ref) (ref)
Total number of study period purchases 0.97 (0.93, 1.02) 0.98 (0.95, 1.01)
Characteristics of index purchasea
Gun show purchase
 Yes 1.49 (0.73, 3.04) 0.86 (0.42, 1.76)
 No (ref) (ref)
Type of purchase
 Dealers’ record of sale (ref) (ref)
 Other 0.99 (0.54, 1.80) 1.09 (0.72, 1.66)
Handgun category
 Revolver 1.78 (1.34, 2.36) 1.30 (1.05, 1.60)
 Semiautomatic (ref) (ref)
 Otherd 1.32 (0.94, 1.84) 0.97 (0.71, 1.33)
Handgun caliber
 Small (ref) (ref)
 Medium 1.33 (0.86, 2.05) 1.42 (1.09, 1.86)
 Largee 1.27 (0.82, 1.96) 0.96 (0.72, 1.27)
Inexpensive handgunf
 Yes 1.21 (0.69, 2.11) 1.00 (0.61, 1.65)
 No (ref) (ref)
Time between index purchase and prior purchase
 Purchaser had only 1 purchase, or less than 2 years between index purchase and prior purchase (ref) (ref)
 2–4 years between index purchase and prior purchase 0.99 (0.64, 1.55) 0.75 (0.50, 1.13)
 5 + years between index purchase and prior purchase 0.63 (0.34, 1.17) 1.00 (0.59, 1.68)
Distance to dealer in meters
 Q1 (ref) (ref)
 Q2 1.14 (0.81, 1.62) 0.99 (0.74, 1.33)
 Q3 1.15 (0.81, 1.63) 0.87 (0.65, 1.17)
 Q4 0.92 (0.64, 1.32) 0.77 (0.57, 1.05)
 Q5 1.02 (0.71, 1.46) 0.69 (0.50, 0.94)
  1. IRR incidence rate ratio, CI confidence interval, ref referent, Q quintile
  2. aThe purchase closest in time to the case’s death
  3. bFirst purchase observed during the study period
  4. cIncludes American Indian, Pacific Islander, other (unspecified), and unknown
  5. dIncludes bolt action, derringer, single-shot, and missing
  6. eIncludes other and unknown caliber
  7. fProxied by manufacturers producing handguns in the bottom quantile of prices listed in the Blue Book of Gun Values
  8. When testing all pairwise comparisons, we additionally identified an association between medium versus large caliber handguns among the older cohort (IRR = 1.49; 95% CI 1.20, 1.85)