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

Table 2 Multiple regression analysis of female suicide SMRs and lithium levels in drinking water

Female	β	p	Adjusted R²
Crude model
Log lithium levels	0.154	0.452	− 0.017
Adjusted model
Log lithium levels	0.313	0.075	0.34
Proportion of elderly people	0.628	0.001
Proportion of one-person households	− 0.099	0.655
Annual marriage rate	− 0.249	0.477
Annual mean income	− 0.289	0.308
Unemployment rate	0.004	0.984
Density of medical doctors per 100,000 people	− 0.178	0.476
Annual total rainfall	0.295	0.101
Proportion of people with a college education or higher	− 0.34	0.28

ISSN: 1347-4715