Figure 9.

Correlation between vaginal microbial species and Shannon diversity index using non-parametric Spearman’s rank correlation test in preterm birth (PTB) group

The x axis and y axis of the correlation plot represent the species and alpha diversity indices. Each box of the plot represents the correlation coefficient value between two variables. The color of each box represents either positive or negative correlation and the color intensity represents the strength of the correlation. Blue squares represent positive correlation, red squares represent negative correlation and white squares represent non-significant correlations.