High serum FSH levels on day 7 of stimulation are negatively associated with oocyte retrieval in GnRH antagonist protocols: real-world evidence from 9,969 IVF cycles in China.

In contrast, BMI, prevalence of PCOS, AMH levels, and the number of oocytes retrieved showed a decreasing trend (all P < 0.001) ( Table 1 ). 3.2 Univariate analysis for number of oocytes retrieved The univariate analysis results are shown in Table 2 .

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For AMH, the association shifted from negative in the lowest stratum (< 1.2 ng/mL: β = −0.08, 95% CI −0.13 to −0.02) to positive in the highest stratum (≥ 5 ng/mL: β = 0.58, 95% CI 0.46 to 0.70), with a highly significant interaction (P for interaction < 0.001).

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There was no significant association among women younger than 35 years, but a marginally significant inverse association in women aged 35 years or older (P for interaction = 0.03).

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