- The study investigated the prevalence of polydactyly (extra fingers or toes) in perinatals using data from the Chinese Birth Defects Monitoring Network between 1996 and 2000, finding 2097 cases among over 2.2 million births, leading to a rate of 9.45 per 10,000.
- Results revealed that males were more frequently affected than females, and there were slight differences between urban (9.60) and rural (9.05) prevalence rates.
- Most polydactyly cases were isolated defects (88.4%), with a significant portion of affected perinatals having them on the right limb (45.62%), while the presence of additional defects