The box-and-whisker diagrams of MMP-9 serum levels in the three patient groups. The box represents the values from the lower quartile Q1 to the upper quartile Q3 while the red line marks the position of the median Q2. If a value exceeds Q3 or falls below Q1 by more than 1.5 × (Q3-Q1), it may be considered an outlier and is marked by a circle. The whiskers indicate the extent of the rest of the data. Three fourths of the measured values in the groups anembryonic pregnancy and incomplete abortion exceed the values in the group ongoing pregnancy, except for the outliers.