Fig. 4

Boxplots comparing Cq values of positive serum pools, processing fluid, and oral fluid samples from different age groups. The whiskers indicate the minimum and maximum values, and the “+” signs indicate the sample means. The horizontal lines in the box represent the upper quartile, median, and lower quartile. Statistical comparison of Cq values was performed via one-way ANOVA. The asterisks above the boxes indicate statistically significant differences. (**: p < 0.01)