*3.1. Statistics of SCC Measured Values*

There were 90 samples in the Cs and 30 samples in the Vs. The SCC values of both sets are shown in Table 1. The SCC ranged from 0.240% to 0.657% in the Cs and from 0.315% to 0.652% in the Vs. The combinations of mean value and standard deviation (SD) were (0.486%, 0.100%) and (0.481%, 0.083%), respectively. The range of SCC in Cs covered that in Vs, which ensured the feasibility of the evaluating model. An ANOVA test was taken to check SCC values in Cs and Vs through SPSS software (Version 23, International Business Machines Corporation, Armonk, NY, USA). The *p* value was 0.008, indicating that there was a significant difference between Cs and Vs.


**Table 1.** Statistics of SCC in Cs and Vs.

Max: the maximum value of the dataset; Min: the minimum value of the dataset; Cs: calibration sets; Vs: validation sets.
