Table 1.

Results of analysis of maternal serum

Descriptive statistics	Element (μg/L)
	Fe	Cu	Zn	Se
Mean	1,132	1,614	514	70
Median	1,165	1,550	520	72
SD	519	295	149	15
Min value	370	1,040	100.0	40
Max value	2,220	2,140	800	106
IQR	895	495	197.5	20.75
Literature values
Ref. [17]		1,484–2,952	413–1,038	19.6–93.7
Ref. [14], [26]*	740 ± 210	2,360 ± 360	680 ± 100	62 ± 10*
Ref. [13], [18]*	1,021 ± 81*	2,042.2 ± 418	584.0 ± 115.2	85.5 ± 12.8
Ref. [19]		2,030 ± 520	650 ± 180
Ref. [5]		1,210.0 ± 610.0	520.0 ± 220
Ref. [15]	727.0 ± 73	1,873 ± 199	705 ± 112
Ref. [25]		1,687 ± 353		68.3 ± 8.5
Ref. [16]	680 ± 260		850 ± 160
Ref. [20]		1,715 ± 268	625 ± 183

* refers to Elem. Conc.