Cesarean section in California--1960 through 1975

Area of Science:

• Obstetrics and Gynecology
• Public Health
• Perinatal Epidemiology

Background:

• The cesarean section rate in California has shown a consistent upward trend since 1965.
• Understanding the factors influencing this rise is crucial for maternal and infant health.
• Historical data analysis is essential for identifying demographic and clinical associations with cesarean delivery.

Purpose of the Study:

• To analyze trends in cesarean section rates in California between 1960 and 1975.
• To examine the relationship between cesarean delivery and maternal/infant variables.
• To investigate potential contributing factors and consequences of rising cesarean rates.

Main Methods:

• Retrospective analysis of cesarean section rates in California from 1960 to 1975.
• Comparison of rates across different maternal age groups, parity, infant birth weights, and gestational ages.
• Examination of maternal mortality ratios for cesarean versus non-cesarean births during 1973-1975.

Main Results:

• Cesarean section rates increased proportionally with infant birth weight and across maternal racial groups.
• Rates rose disproportionately more for women under 20 years and those of first parity.
• Cesarean births were associated with double the maternal mortality ratio compared to non-cesarean births (1973-1975).
• Increased rates were observed for post-term births (gestational age > 42 weeks).

Conclusions:

• Rising cesarean rates are linked to demographic shifts, increased interventions like fetal monitoring, and the medical-legal environment.
• Cesarean delivery poses higher risks of maternal morbidity and mortality, as well as iatrogenic prematurity and respiratory distress in infants.
• Further research into indications and risk-benefit analysis is warranted to optimize delivery practices.