Table 1: Anti-C1q antibody concentrations in 60 women with failed pregnancies, including 30 women with ectopic pregnancy (EP) and missed abortion (MA) and 33 women with intrauterine pregnancy (IUP). The nonparametric Kruskal-Wallis test was used to identify differences among EP, MA, and viable IUP. To perform pairwise comparisons between groups Mann-Whitney test was conducted determining as critical value for significance P = 0.0167 after using Bonferroni correction which determined as critical value of significance for each (Mann-Whitney) test the value 0.0167. Therefore anti-C1q antibody levels are not helpful in differentiating between the three groups since as shown in Table 1 there is no P value <0.167.

Failed pregnancies (MA and EP) Normal P value Anti-C1q Median 30.92 38.95 0.018 * IQR 17.89–40.79 28.95–59.01     Pregnancy outcome         IUP MA EP     Anti-C1q Median 38.95 31.97 18.82   0.045 ** IQR 28.95–59.01 23.95–39.47 16.32–40.79

Mann-Whitney test. **Kruskal-Wallis test.