The prevalence of<unk> is difficult to establish because of differences in definition and the reluctance of patients to admit to abnormal cravings and ingestion, thus leading to the prevalence recordings of<unk> among at-risk groups being in the range of 8% to 65% depending on the study. Based on compiled self-report and interview data of pregnant and postpartum women,<unk> is most prevalent geographically in Africa, with an estimated prevalence of 44.8%, followed by North and South America (23.0%) and Eurasia (17.5%). Factors associated with<unk> in this population were determined to be anemia and low levels of education, both of which are associated with low socioeconomic backgrounds. Two studies of adults with intellectual disability living in institutions found that 21.8% and 25.8% of these groups had<unk>  Prevalence rates for children are unknown. Young children commonly place non-nutritious material into their mouths. This activity occurs in 75% of 12-month-old infants, and 15% of two- to three-year-old children. In institutionalized children with mental disabilities,<unk> occurs in 10–33%.
Pica 
Enostosis
Hyperostosis
Hypercementosis
Neutrophilia
Joint stiffness
Exostosis
Hemimelia