Masaki Ogawa1, Yoshio Matsuda2, Akihito Nakai3, Masako Hayashi3, Shoji Sato4, Shigeki Matsubara5. 1. Perinatal Medical Center, Tokyo Women's Medical University, Kawadacho 8-1, Shinjuku, Tokyo 1628666, Japan. Electronic address: masakiogawa3@gmail.com. 2. Department of Obstetrics and Gynecology, International University of Health and Welfare Hospital, 537-3 Iguchi Nasushiobara, Tochigi 3292763, Japan. 3. Department of Obstetrics and Gynecology, Tama-Nagayama Hospital, Nippon Medical School, 1-7-1 Nagayama, Tama City, Tokyo 2068512, Japan. 4. Maternal and Perinatal Care Center, Oita Prefectural Hospital Bunyo 476, Oita 8708511, Japan. 5. Department of Obstetrics and Gynecology, Jichi Medical University, 3311-1 Shimotsuke, Tochigi 3290498, Japan.
Abstract
OBJECTIVES: Placental weight (PW) and fetal/placental weight ratio (F/P) have been considered to be useful parameters for understanding the pathophysiology of fetal growth. However, there have been no standard data on PW and F/P in Asian populations. This study was conducted to establish nomograms of PW and F/P in the Japanese population and to clarify characteristics of PW and F/P in this population. STUDY DESIGN: Included in the study were 79,590 Japanese cases: 58,871 vaginal and 20,719 cesarean deliveries at obstetrical facilities (2001-2002) and registered to the Japan Society of Obstetrics and Gynecology Database. Multiple pregnancies, stillbirths, and fetal anomalies were excluded. Nomograms of PW and F/P were created by spline methods in groups categorized by fetal sex (male or female) and maternal parity (primipara or multipara). RESULTS: Standard curves of PW and F/P were established, which indicated that PW and F/P were lower in cesarean deliveries than vaginal deliveries, especially during preterm period. PW differed depending on fetal sex and maternal parity. F/P differed according to fetal sex. CONCLUSION: We for the first time established standard curves of PW and F/P in the Japanese population with statistically sufficient data, which showed that PW and F/P were lower in cesarean deliveries. PW and F/P were also affected by fetal sex. These data might be useful to understand the pathophysiology between the fetus and placenta in utero.
OBJECTIVES: Placental weight (PW) and fetal/placental weight ratio (F/P) have been considered to be useful parameters for understanding the pathophysiology of fetal growth. However, there have been no standard data on PW and F/P in Asian populations. This study was conducted to establish nomograms of PW and F/P in the Japanese population and to clarify characteristics of PW and F/P in this population. STUDY DESIGN: Included in the study were 79,590 Japanese cases: 58,871 vaginal and 20,719 cesarean deliveries at obstetrical facilities (2001-2002) and registered to the Japan Society of Obstetrics and Gynecology Database. Multiple pregnancies, stillbirths, and fetal anomalies were excluded. Nomograms of PW and F/P were created by spline methods in groups categorized by fetal sex (male or female) and maternal parity (primipara or multipara). RESULTS: Standard curves of PW and F/P were established, which indicated that PW and F/P were lower in cesarean deliveries than vaginal deliveries, especially during preterm period. PW differed depending on fetal sex and maternal parity. F/P differed according to fetal sex. CONCLUSION: We for the first time established standard curves of PW and F/P in the Japanese population with statistically sufficient data, which showed that PW and F/P were lower in cesarean deliveries. PW and F/P were also affected by fetal sex. These data might be useful to understand the pathophysiology between the fetus and placenta in utero.
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