Associations between maternal blood metal concentrations during the first trimester and spontaneous preterm birth: a nested case-control study

Environmental Sciences Europe

Table 2 Statistical summary of blood metal concentration during the first trimester of participants

Metals (μg/L)	Median	5th	25th	75th	95th	P
Vanadium						< 0.001
Case	2.90	2.57	2.74	3.04	3.19
Control	2.74	2.54	2.62	2.86	3.01
Calcium						> 0.999
Case	56,509.98	50,097.50	53,704.52	59,816.42	68,152.64
Control	56,910.76	50,899.06	53,704.52	60,117.00	65,747.96
Cadmium						0.889
Case	0.64	0.32	0.44	0.91	1.32
Control	0.62	0.33	0.48	0.86	1.36
Lithium						0.844
Case	0.39	0.14	0.29	0.57	0.76
Control	0.41	0.14	0.27	0.54	0.86
Magnesium						0.013
Case	30,867.35	27,950.75	29,409.05	32,082.60	33,832.56
Control	29,895.15	27,950.75	28,922.95	30,867.35	32,823.90
Manganese						0.792
Case	6.82	3.00	4.80	12.06	18.78
Control	9.49	3.61	5.96	12.79	17.59
Molybdenum						0.791
Case	1.14	0.75	1.00	1.37	2.10
Control	1.20	0.80	1.02	1.38	1.84
Lead						0.303
Case	10.00	5.00	8.00	13.25	26.20
Control	10.00	5.00	8.00	12.00	23.05
Arsenic						0.511
Case	3.72	1.35	2.38	5.41	11.11
Control	3.22	1.72	2.57	5.13	11.12
Strontium						0.792
Case	20.05	12.95	17.09	22.68	29.63
Control	20.66	14.39	18.07	24.27	28.67
Iron						0.249
Case	288,439.40	213,579.20	278,108.10	302,540.30	326,274.40
Control	282,854.90	217,153.30	276,432.80	299,608.40	324,152.30
Copper						0.012
Case	593.52	460.87	522.82	650.87	760.42
Control	556.98	444.57	503.76	618.94	750.70
Selenium						0.236
Case	133.52	100.76	117.51	152.13	187.60
Control	129.49	100.62	115.30	147.62	185.52
Zinc						0.639
Case	4397.13	3084.07	4000.77	4598.99	4990.98
Control	4370.65	2961.42	3781.91	4533.61	5032.53