Table 2.

A. Lactoferrin concentration according to birth weight and stage of lactation.
Birth weight	Milk sample	n	Lactoferrin concentration (mg/mL)
			Mean±SD	Median (IQR)	Min	Max
All subjects	Colostrum	277	14.92±7.96	12.66 (9.64 – 17.94)	3.57	44.99
	Transitional milk	55	10.73±5.67	10.01 (7.24 – 13.37)	3.52	41.19
	Mature milk at 1 month	259	10.34±6.27	8.98 (6.27 – 12.19)	0.91	40.34
	Mature milk at 2 months	104	8.52±6.47	6.72 (4.19 – 10.65)	0.92	36.76
1500–2000g	Colostrum	119	15.62±8.54	12.98 (9.90 – 17.30)	3.57	44.99
	Transitional milk	16	11.53±8.48	9.13 (7.35 – 12.31)	5.41	41.19
	Mature milk at 1 month	111	9.94±6.50	8.18 (5.73 – 11.29)	0.91	40.22
	Mature milk at 2 months	30	8.75±6.82	5.95 (3.80 – 13.20)	0.92	25.34
<1500g	Colostrum	158	14.40±7.47	12.42 (9.26 – 18.16)	3.60	44.59
	Transitional milk	39	10.40±4.11	10.34 (7.19 – 13.37)	3.52	20.55
	Mature milk at 1 month	148	10.64±6.10	9.19 (6.47 – 12.84)	2.12	40.34
	Mature milk at 2 months	74	8.43±6.37	7.00 (4.60 – 10.26)	2.11	36.73

B. Lactoferrin concentration according to days postpartum*
Days postpartum	n	Lactoferrin concentration (mg/mL)
		Mean±SD)	P50 (IQR)
0–5 days	177	16.4±8.90	13.46 (10.35–20.46)
6–10 days	140	11.9±5.29	11.18 (8.43–14.08)
11–30 days	142	10.3±5.9	8.74 (6.40–12.38)
>30 days	236	9.57±6.48	7.76 (5.19–11.78)

IQR: interquartile range; SD: standard deviation

^*Based on the categorization of days postpartum described by Rai et al.(17)