Univariable logistic regressions showed that among premenopausal women, current smoking, OCP use for 2–5 years and for 5–10 years, CRP level, and history of endometriosis demonstrated possible associations (p < 0.25) with CA125 levels ≥ 35 U/ml (N = 101) (Table 4). Here, CRP is linked to endometriosis.