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. 2017 Nov 28;5:320. doi: 10.3389/fpubh.2017.00320

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Copyright © 2017 Leiva, Bouchard, Abdullah and Ecochard.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Number of cycles with one positive day [luteinizing hormone (LH) threshold ≥25 mlU/ml] followed by three consecutive negative days (LH thresholds ≤25 mlU/ml) in relation to ultrasound day of ovulation (0 US-DO).