Table S6.

Estimates of the waiting period effect, controlling for other gun policies

1970–20141977–2014
Type of violence(1)(2)
All homicide
 Waiting period−0.141 (0.061)**−0.137 (0.051)**
 Background check0.054 (0.065)0.019 (0.068)
 Handgun permit0.021 (0.089)0.051 (0.091)
 Shall-issue CCW0.002 (0.104)0.056 (0.095)
 May-issue CCW0.006 (0.118)0.062 (0.097)
Gun homicide
 Waiting period−0.201 (0.086)**−0.194 (0.074)**
 Background check0.010 (0.084)0.007 (0.090)
 Handgun permit0.075 (0.093)0.084 (0.125)
 Shall-issue CCW−0.019 (0.119)0.078 (0.118)
 May-issue CCW−0.035 (0.137)0.046 (0.118)
Non-gun homicide
 Waiting period−0.033 (0.055)−0.035 (0.033)
 Background check0.135 (0.055)**0.042 (0.053)
 Handgun permit−0.077 (0.100)0.006 (0.054)
 Shall-issue CCW0.063 (0.083)0.045 (0.062)
 May-issue CCW0.110 (0.096)0.118 (0.073)
All Suicide
 Waiting period−0.037 (0.023)−0.016 (0.011)
 Background check0.066 (0.029)**0.012 (0.017)
 Handgun Permit−0.167 (0.070)**−0.092 (0.036)**
 Shall-issue CCW0.044 (0.040)0.013 (0.026)
 May-issue CCW0.025 (0.046)0.014 (0.026)
Gun suicide
 Waiting period−0.083 (0.031)***−0.066 (0.019)***
 Background check0.064 (0.034)*0.015 (0.023)
 Handgun permit−0.196 (0.078)**−0.101 (0.037)***
 Shall-issue CCW0.007 (0.048)0.008 (0.031)
 May-issue CCW−0.029 (0.063)−0.012 (0.039)
Non-gun suicide
 Waiting period−0.021 (0.047)−0.001 (0.030)
 Background check0.119 (0.050)**0.062 (0.030)**
 Handgun permit−0.156 (0.062)**−0.059 (0.040)
 Shall-issue CCW0.176 (0.049)***0.085 (0.028)***
 May-issue CCW0.152 (0.054)***0.093 (0.027)***
  • Coefficients estimate the effect of waiting periods and background checks on the number of deaths per 100,000 adult residents. Models mirror those of Table 1. Model 1 includes only the policy variables shown. Model 2 follows the specification of Ludwig and Cook (8) and uses fewer years of data due to missing control variables in earlier years. SEs, shown in parentheses, are clustered by state. *P < 0.10; **P < 0.05; ***P < 0.01. CCW, carrying of a concealed weapon.