Co-occurrence of endometriosis and uterine fibroids: a systematic review and meta-analysis.

A trend toward progressively stronger associations was observed with increasing prevalence of multiparity, although between-group differences did not reach statistical significance (p = 0.09).

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Parity showed a trend effect: OR 1.56 (95% CI: 0.53–4.59) for studies with >50% nulliparous women, 4.52 (95% CI: 2.53–8.10) for those with >50% multiparous, 5.23 (95% CI, 2.09–13.04) for studies with >95% multiparous women.

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