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

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

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

ISSN: 1347-4715