Additionally, there was an indication that MCP-4 levels decreased with increasing severity among the endometriosis cases (GM for mild of 130.8 with 95% CI of 89.4–191.5 vs. GM for severe of 78.9 with 95% CI of 70.6–88.3; p-trend = 0.07; Figure 5; Table S3). This evidence concerns the gene CCL13 and endometriosis.