achondroplasia was , however , less common with a point prevalence at birth of 1.3 per 100,000 , while osteogenesis imperfecta ( 21.8 ) , multiple epiphyseal dysplasia tarda ( 9.0 ) , achondrogenesis ( 6.4 ) , osteopetrosis ( 5.1 ) , and thanatophoric dysplasia ( 3.8 ) were found more frequently .
C0001080
achondroplasia
C0039743
thanatophoric dysplasia