Table 6.

Sodium, potassium, calcium, magnesium, phosphorus, iron, selenium and iodine content in breast milk, as well Ca/P ratio, presented as mean, standard deviation and range across different groups of samples (lactating time or LT, BMI, newborn sex).

Mineral	Statistic	LT < 6 Months (n = 48)	LT ≥ 6 Months (n = 27)	BMI < 25 kg/m2 (n = 41)	BMI ≥ 25 kg/m2 (n = 34)	Infant Gender ♂ (n = 33)	Infant Gender ♀ (n = 42)
Na (mg/L)	Mean	133.53	256.37	132.37 *	205 *	212.39 *	131.30 *
	SD	55.16	242.31	66.72	156.08	200.60	30
	Range	44.75–303.88	46.81–942.67	44.75–371.21	69.71–942.67	44.75–389.21	68.04–942.67
K (mg/L)	Mean	465.37	438.03	449.00	476.86	450.42	463.60
	SD	64.57	60.29	58.49	77.01	65.54	282.96
	Range	345.57–622.25	342.98–550.27	345.57–579.69	342.98–622.25	353.34–622.25	342.98–599.71
Ca (mg/L)	Mean	295.15 *	251.94 *	281.93	275.09	282.96	278.69
	SD	55.18	58.24	59.72	56.90	63.94	55.28
	Range	196.1–463.26	136.44–383.5	192.60–463.26	136.44–382.50	197.81–381.38	136.44–463.26
P (mg/L)	Mean	126.79	127.02	133.38	120	122.38 *	132.66 *
	SD	26.56	34.10	29.47	30.07	32.35	23.44
	Range	79.82–177.95	73–219.57	83.93–210.57	73.00–177.95	82.50–177.95	73–219.57
Ca/P (ratio)	Mean	2.39 *	2.07 *	2.17	2.39	2.41 *	2.13 *
	SD	0.55	0.54	0.55	0.60	0.65	0.42
	Range	1.34–4.44	1.16–3.36	1.29–4.44	1.16–3.44	1.29–3.14	1.16–4.44
Mg (mg/L)	Mean	32.96	33.63	33.38	33.20	34.56	31.78
	SD	6.82	5.75	7.08	4.85	6.43	6.28
	Range	19.86–50.83	20.77–44.78	19.86–50.83	20.77–44.78	19.86–44.78	20.77–50.83
Fe (mg/L)	Mean	0.22	0.24	0.22	0.24	0.21	0.24
	SD	0.10	0.17	0.09	0.15	0.10	0.14
	Range	0.10–0.45	0.06–0.75	0.06–0.42	0.06–0.75	0.06–0.45	0.06–0.74
Se (µg/L)	Mean	11.41	21.99	11.60	12.07	18.95	10.66
	SD	5.00	33.55	5.65	4.85	27.44	4.21
	Range	4.37–25.85	6.18–148.97	4.37–28.13	5.30–148.97	4.37–21.14	6.18–148.97
I (µg/L)	Mean	110.92 *	75.27 *	104.83	97	96.03	99.16
	SD	53.61	61.61	62.09	53.36	68.01	52.72
	Range	26.71–233.19	11.25–247.63	11.25–247.63	26.71–233.19	26,71–247.63	11.25–233.19

Significant differences between groups (*).