Analysis of sterilization failure in Brazil

Area of Science:

• Reproductive Health
• Surgical Outcomes
• Public Health

Background:

• Female sterilization is a common method of contraception worldwide.
• Understanding sterilization failure rates is crucial for effective family planning programs.
• Previous studies have shown varying failure rates depending on methodology and population.

Purpose of the Study:

• To determine the cumulative sterilization failure rate in a large cohort of women in Rio de Janeiro.
• To identify factors associated with sterilization failure.
• To provide data for improving the safety and efficacy of female sterilization procedures.

Main Methods:

• A lifetable analysis was used to calculate cumulative failure rates.
• Multivariate analysis was employed to assess the impact of various factors on failure rates.
• Data were collected from 13,423 female sterilization procedures performed between 1981 and 1984.

Main Results:

• The cumulative failure rate was 0.54 at 12 months and 1.04 at 48 months per 100 initial sterilizations.
• Woman's age at sterilization was a statistically significant factor influencing failure rates at 12 and 24 months.
• Factors such as training period, surgeon's daily procedure volume, and year of sterilization were not statistically significant predictors of failure.

Conclusions:

• Sterilization failure is a low but significant risk, increasing over time.
• Younger age at sterilization is associated with a higher risk of failure.
• Further research may be needed to explore other potential contributing factors to sterilization failure.