Consecutive repeat miscarriages are likely to occur in the same gestational period.

Area of Science:

• Reproductive Medicine
• Obstetrics and Gynecology
• Human Reproduction Research

Background:

• Recurrent miscarriage (RM) affects a significant number of women, impacting reproductive health.
• Understanding patterns in RM, such as gestational timing, is crucial for diagnosis and management.
• Previous research has not fully elucidated the consistency of gestational periods in consecutive miscarriages.

Purpose of the Study:

• To investigate the frequency of consecutive miscarriages occurring within the same gestational period in women with RM.
• To compare observed frequencies with theoretically expected probabilities.

Main Methods:

• Retrospective observational study design.
• Analysis of 1589 miscarriage events from 543 women diagnosed with recurrent miscarriage.
• Statistical comparison of observed miscarriage timing with expected probabilities.

Main Results:

• Women with two miscarriages showed 49.17% of losses in the same gestational period, significantly higher than the expected 34.54% (P<0.01).
• For women with three, four, or five+ miscarriages, the proportions were 28.72%, 19.44%, and 18.60% respectively, all significantly exceeding expected probabilities.
• Observed consistency in gestational timing of miscarriages was notably higher than theoretical calculations for the general population.

Conclusions:

• Consecutive miscarriages in women with RM show a statistically significant tendency to occur within the same gestational period.
• This finding suggests a potential underlying biological or etiological factor influencing miscarriage timing in affected women.
• Further research is warranted to explore the implications of this consistent timing for understanding RM etiology and developing targeted interventions.