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Background:  The role of motile sperm count in intrauterine insemination (IUI) success rate is controversial. This retrospective cohort study performed among unselected infertile couples undergoing IUI was to explore the association between the total progressive motile sperm count (TPMSC) and the live birth rate (LBR) following IUI. Methods:  The total cohort of 5363 cycles, 2666 infertile couples between January 2015 and December 2018 and finally 5171 cycles, 2647 couples were included for analysis in Sun Yat-sen memorial hospital of Sun Yat-sen University. The primary outcome was LBR per cycle. And the secondary outcome measure was clinical pregnancy rate (CPR) per cycle. Results:  From the receiver operating characteristic (ROC) analysis of female age predicting live birth, female age cutoff was defined as 28 years. With a female age of ≤28 years, the CPRs were 11.5%, 14.9%, 16.1%, and 15.8% in quartile groups of pre-wash TPMSC, respectively. For the LBRs the values were 9.4%, 12.9%, 14.4%, and 11.3%, and there were also no significant differences in quartile groups of pre-wash TPMSC with ≤24 million (M), [24M–50M], [50M–97M], &gt;97M. No statistically significant differences in the CPRs ( p  = .051) and LBRs ( p  = .088) were also observed in the quartiles groups of post-wash TPMSC. With a female age of &gt;28 years, the CPR in couples with post-wash TPMSC ≤22.32 M was significantly lower than with post-wash TPMSC &gt;81.0 M ( p  = .007). There was an obvious trend in which CPRs and LBRs increased with the post-wash TPMSC during the &lt;81 M interval in women &gt;28 years. Conclusions:  The optimal female age cutoff for live birth was 28 years in IUI cycles. Pre-wash and post-wash TPMSC were not significantly associated with CPR and LBR per cycle. When female age &gt;28 years, there was a better outcome with post-wash TPMSC &gt;22.32 million.

The relationship of total progressive motile sperm count with the outcome of IUI? An analysis of 5171 cycles