Type I:<unk>  tarda
Fragile bones with fractures occurring after minimal trauma.
Presents in early infancy
Blue sclera
Hearing loss (50%)
Dentinogenesis<unk>  in some (opalescent or yellow-brown discoloration of tooth enamel)
Type II:<unk>  congenita
Lethal perinatally or before 1st year of life
Most common cause of death is pulmonary hypoplasia
Severe deformity
Type III
Fragile bones with fractures occurring after minimal trauma.
Bone deformity (progressive)
Blue sclera (variable, may fade with age)
Hearing loss
Dentinogenesis<unk> 
Short stature
Type IV
Fragile bones with fractures occurring after minimal trauma.
Bone deformity
Short stature (variable)
Hearing loss in some
White or blue sclera
Dentiogenesis<unk>  in some
Osteogenesis imperfecta
Child abuse
Myositis ossificans
Primary juvenile osteoporosis
Ehlers-Danlos syndrome
Hypogonadism
Paget's disease of bone
Malignancy