Table 2.

Concentrations of human milk minerals and trace elements (mg/kg).

Element	Mean	SD	1st Quartile	Median	3rd Quartile
Na	91.681	34.946	69.030	89.605	106.320
K	408.629	168.566	271.600	375.303	547.200
Cu	0.221	0.067	0.180	0.232	0.265
Mg	25.045	6.492	20.550	24.332	29.558
Fe	2.427	0.899	1.827	2.366	2.949
Zn	0.987	0.680	0.443	0.796	1.453
Mn	0.041	0.020	0.028	0.036	0.051
Ca	316.361	75.498	256.500	301.907	370.100
Se	0.013	0.016	0.006	0.008	0.013