Table 5.

Comparing to the breast milk macronutrients concentration in different areas of China

Area	N	Lactation period	Method	Concentration (Mean ± SD or Median (IQR),g/100 mL)
Protein
Our study	220	0 to 12 months	Miris human milk analyzer	1.37 ± 0.73
East of China [9]a	90	2 to 4 months	Miris human milk analyzer	0.8 ± 0.1
Shanxi [20]	4317	0 to 15 months	Miris human milk analyzer	1.5 ± 0.5
Sichuan [21]	60	0 to 9 months	Miris human milk analyzer	1.14 (1.09,1.19)
Fat
Our study	220	0 to 12 months	Miris human milk analyzer	3.2 ± 1.43
East of China	90	2 to 4 months	Miris human milk analyzer	3.1 ± 1.4
Shanxi	4317	0 to 15 months	Miris human milk analyzer	5.9 ± 2.1
Sichuan	60	0 to 9 months	Miris human milk analyzer	4.1 ± 1.6
Lactose
Our study	220	0 to 12 months	Miris human milk analyzer	6.51 ± 0.40
East of China	90	2 to 4 months	Miris human milk analyzer	7.2 ± 0.3
Shanxi	4317	0 to 15 months	Miris human milk analyzer	6.6 ± 1.5
Sichuan	60	0 to 9 months	Miris human milk analyzer	7.19 (6.78,7.42)

^a: The breast milk composition represented three cities from east of China, including Beijing, Guangzhou and Suzhou