Cumulative Live Birth Rate per Oocyte Aspiration in Artificial Reproduction Technology: A Retrospective Observational Study of the Association between Maternal Age and the Number of Oocytes Retrieved in an Indian Population

The association between cumulative live birth rate (CLBR) and oocyte aspiration in the context of maternal age is not well understood in the Indian population.

To find the relationship between CLBR and a single oocyte aspiration.

This is a retrospective study analysing the data of 1989 women who underwent in vitro fertilisation (IVF) between January 2015 and December 2019, at Gunasheela Surgical and Maternity Hospital, India.

Participants were divided into two groups based on age: ≤35 (group I, n = 1665) and >35 (Group II, n = 324). CLBR per single oocyte aspiration in fresh and subsequent three frozen embryo transfer cycles was estimated.

Logistic regression analysis was used to show the likelihood of pregnancy rate, and CLBR per aspiration after treatment was represented as odd's ratios (OR) with 95% confidence intervals.

Maximal CLBR for Groups I and II was 81.25% with >25 oocytes and 75% with 16-20 oocytes, respectively. In the fresh ET cycle, maximal pregnancy and live birth rates were observed in 6-10 oocytes for Group I (54% and 41%) and in 16-20 oocytes for Group II (75% and 75%). The ORs for pregnancy rate (P = 0.01) and CLBR (P = 0.007) increased with an increase in the number of oocytes retrieved. The ORs for pregnancy rate and CLBR for Group II were 0.68 (P = 0.002) and 0.58 (P = 0.00002), respectively as compared to Group I. Optimal oocytes required to achieve positive IVF outcomes in fresh/frozen ET cycles were low in Group I (6-10 oocytes), but higher in Group II (16-20 oocytes).

Robust positive relationship was observed between the number of oocytes retrieved and CLBR in women of both age groups.