Table 1.

Main measurement results of two milk analyzers (mean ± SD)

	MIR (n = 546)	Ultrasound (n = 465)	Adjusted ultrasound (n = 465)	P-valuea	P-valueb
Protein (g/dl)	2.27 ± 0.20	1.29 ± 0.26	2.28 ± 0.26	< 0.0001	0.9998
Fat (g/dl)	3.09 ± 0.77	2.83 ± 1.18	3.15 ± 0.54	< 0.0001	0.8396
Lactose (g/dl)	6.03 ± 0.39	7.33 ± 0.34	5.99 ± 0.34	< 0.0001	0.9997
Energy (kj/dl)	268.51 ± 33.69	259.07 ± 46.48	269.80 ± 20.78	< 0.0001	0.9224

Paired t-test was used for comparison between groups; Continuous variables were presented as mean ± SD; MIR: mid-infrared

^a refers to the comparison between MIR and ultrasound results

^b refers to the comparison between MIR and adjusted ultrasound results