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Generalized joint hypermobility and black admixture in school children of Bahia, Brazil
Insights
Generalized joint hypermobility (GJH) was studied in 3,000 Brazilian school children. A lower frequency of GJH was observed in children with darker skin pigmentation, particularly among older children.
Area of Science:
- Pediatrics
- Human Genetics
- Epidemiology
Background:
- Joint hypermobility is a condition affecting connective tissue.
- Prevalence and associated factors in pediatric populations require further investigation.
Purpose of the Study:
- To investigate the prevalence of generalized joint hypermobility in school children in Bahia, Brazil.
- To explore potential associations between joint hypermobility and factors such as age, sex, and race.
Main Methods:
- A sample of 3,000 school children aged 6-7 years was assessed.
- A stratified sampling method ensured equal representation across size classes, controlling for age, sex, and race.
- Race was categorized into five subgroups to analyze black admixture.
Main Results:
- The overall prevalence of generalized joint hypermobility was 2.3%.
- A negative correlation was observed between darker skin pigmentation and hypermobility frequency.
- This association was influenced by age, with younger, less admixed children showing higher prevalence.
Conclusions:
- Generalized joint hypermobility affects a small percentage of school children in Bahia.
- Skin pigmentation and age appear to be associated with hypermobility prevalence in this population.
- Further research is needed to elucidate the complex interplay of genetic and environmental factors.
Abstract:
Joint hypermobility was investigated in a sample of 3,000 school children, ages 6--7 years, in Bahia, Brazil. A sampling method was designed to assure an equal number of 50 children in the smallest size classes, when age, race, and sex were held constant. Race was classified in five subgroups to assess the proportion of black admixture. The overall frequency of generalized joint hypermobility was 2.3%. The darker the children the lower the frequency of affected children. However, this racial effect was also associated with age: The highest frequency of generalized joint hypermobility was among the youngest and less black mixed children, whereas among the oldest and darker children there was no case of joint hypermobility.