Spss v 21.0 statistical

SPSS V.21.0 statistical software was used for the data analysis, and the Kolmogorov–Smirnov normality test was performed for all data. The measured data with a normal distribution are represented as the mean and SD. Comparisons were conducted between two groups, and comparisons were performed using independent t-tests. Measurement data with non-normal distributions are expressed as medians (interquartile intervals). In this situation, two groups were compared by using the Mann–Whitney rank-sum test. Categorical variables are shown as the number of cases, and the χ² test was adopted to demonstrate the differences within two or more groups. Spearman correlation analysis compared the relationship between PRL levels and the other variables. The relationships among PRL, NAFLD and MetS were analysed by logistic regression. Values of p<0.05 or p<0.01 represented obvious significant differences.

Data were recorded into EpiData V.3.1 system and processed by SPSS V.21.0 statistical software. The mean and SD were used to statistically describe the measurement data, and the counting data were presented by composition ratio, frequency, and parity arrangement.