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Table 1 Multiple regression analysis of male suicide SMRs and lithium levels in drinking water

From: Association between lithium in tap water and suicide mortality rates in Miyazaki Prefecture

Male β p Adjusted R2
Crude model    
 Log lithium levels 0.061 0.769 − 0.038
Adjusted model    
 Log lithium levels 0.303 0.06 0.475
 Proportion of elderly people 0.545 0.002  
 Proportion of one-person households 0.005 0.979  
 Annual marriage rate − 0.035 0.249  
 Annual mean income − 0.158 0.534  
 Unemployment rate − 0.072 0.672  
 Density of medical doctors per 100,000 people − 0.064 0.774  
 Annual total rainfall 0.374 0.029  
 Proportion of people with a college education or higher − 0.041 0.885