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Summary. The Cervical Resistance Index (CRI) was measured in 20 patients with a history of previous spontaneous midtrimester abortion. The mean CRI was 2.44±0.78 in patients with a history suggestive of cervical incompetence and 4.91±0.41 in 102 patients who were parous women with normal menstrual cycles. This new procedure which is used in the non‐pregnant state provides an additional method for diagnosis of cervical incompetence.
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Anthony et al. (1982) studied this question.
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