1. Decreased levels of interleukin-18 in peritoneal fluid but not in serum of patients with endometriosis 
Xinmei Zhang, M.D., Jun Lin, M.D., Yuli Qian, M.D., Lin Deng, M.D. 
Fertility and Sterility 
Volume 81, Issue 5, Pages (May 2004)
DOI: /j.fertnstert

2. FIGURE 1
Concentrations of IL-18 in relation to the stage of endometriosis. The data indicate no statistically significant difference in IL-18 concentrations in peritoneal fluid and serum among the women with different stages of endometriosis. P = peritoneal fluid; S = serum.
Zhang. IL-8 and endometriosis. Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )

3. FIGURE 2
Peritoneal fluid and serum IL-18 concentrations in relation to the phase of the menstrual cycle. The data show no statistically significant differences in peritoneal fluid and serum IL-18 levels in relation to the cycle phases. • = endometriosis; ▴ = no endometriosis; P = peritoneal fluid; S = serum.
Zhang. IL-8 and endometriosis. Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )