Table 2.

Environmental heavy metals of adults aged 40 years or older by depression in NHANES 2017–2018.

Depression	No(2903)	Yes(344)	t-test
Blood lead(ug/L)	1.46 ± 1.56	1.31 ± 1.03	t = 2.36
Blood cadmium(ug/L)	0.5 ± 0.57	0.65 ± 0.73	t = 12.16*
Blood mercury(ug/L)	1.6 ± 2.87	1.03 ± 1.68	t = 5.19*
Blood selenium(ug/L)	191.84 ± 28.2	189.41 ± 24.4	t = 2.54
Blood manganese(ug/L)	9.71 ± 3.5	9.7 ± 3.56	t = 0.95
Blood inorganic mercury(ug/L)	0.25 ± 0.62	0.2 ± 0.15	t = 0.75
Blood ethylmercury(ug/L)	0.05 ± 0.01	0.05 ± 0.05	t = 1.57
Blood methylmercury(ug/L)	1.33 ± 2.54	0.83 ± 1.53	t = 5.26*
Blood chromium(ug/L)	0.36 ± 0.34	0.32 ± 0.13	t = 1.39
Blood cobalt(ug/L)	0.52 ± 0.2	0.2 ± 0.17	t = 2.55

^*P < 0.001.