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Table 3 Global regression estimates on standardized mortality ratios (SMRs) for suicide (2005–2009)

From: Geospatial examination of lithium in drinking water and suicide mortality

  OLS (full): OLS (stepwise): SAR:
  Coeff. t-val. p-val. Coeff. t-val. p-val. Coeff. z-val. p-val.
Intercept 0.612 1.908 0.060 0.419 2.491 0.014 * 0.159 0.977 0.329
Lithium level −7.000 −4.347 0.000 *** −7.139 −4.847 0.000 *** −4.844 −3.489 0.000 ***
Population density 0.000 0.565 0.574       
Per capita income −0.013 −1.039 0.301       
Prop. of Roman Catholics 0.005 2.410 0.018 * 0.006 3.143 0.002 ** 0.004 2.573 0.010 **
Unemployment rate −0.038 −1.597 0.114       
Psychiatrist density −0.053 −1.110 0.270 −0.041 −1.479 0.142 −0.040 −1.608 0.108
Psychotherapist density −0.001 −0.116 0.908       
Gen. practitioner density 0.016 1.146 0.255       
ρ        0.448   0.001 ***
  1. Signif.: ‘***’ 0.001, ‘**’ 0.01, ‘*’ 0.05.