Temporal trends and regional variations in operative vaginal deliveries in Japan: A national representative cohort study.

Abstract

To analyze temporal trends and regional variations in operative vaginal delivery (OVD) in Japan. Using the National Database of Health Insurance Claims and Specific Health Checkups of Japan from 2014 to 2021, we identified the numbers of vacuum and forceps deliveries. We analyzed annual totals and proportions of OVDs and calculated the mean age of women undergoing these deliveries. We also predicted trends in OVD for the next 20 years and compared geographical differences in the proportions of forceps deliveries among OVDs. During the observation period, out of 7 368 814 total births, 8.4% were through OVD, including 7.6% by vacuum and 0.8% by forceps. Both delivery methods showed an increasing trend from 2014 to 2021: vacuum deliveries rose from 7.0% to 8.7%, and forceps deliveries increased from 0.6% to 1.0%. Notably, the proportion of forceps deliveries in OVD increased from 8.1% to 10.5%. The mean age was higher for forceps deliveries than vacuum deliveries. According to our predictions, vacuum deliveries may continue to increase, but forceps deliveries may stabilize. The proportion of forceps deliveries among OVDs ranged from 0% to 38% across Japanese prefectures. This study shows an increase in the use of OVD in Japan from 2014 to 2021. There are large regional differences in the choice between vacuum and forceps deliveries. These findings can help us understand the practice of OVD in Japan.