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Authors’ reply to Fountain and colleagues

We appreciate Fountain and colleagues’ comments.1 2 We did consider how the dates of the last menstrual period might affect a possible diagnosis of miscarriage, and we draw readers’ attention to the sub-section of the results that deals with this—the revised criteria for diagnosing miscarriage contained in table 5 and fig 2.

We did not consider menstrual cycle length as a variable. We thought that making assumptions about the timing of ovulation in these circumstances, coupled with the known variations in the ovulation-implantation interval,3 would make this difficult to integrate into reliable guidelines that would be …