<unk>  occurs in about 2.1 per 1000 live births. In those born at term rates are lower at 1 per 1000 live births. Rates appear to be similar in both the developing and developed world. Within a population it may occur more often in poorer people. The rate is higher in males than in females; in Europe it is 1.3 times more common in males. There was a "moderate, but significant" rise in the prevalence of<unk>  between the 1970s and 1990s. This is thought to be due to a rise in low birth weight of infants and the increased survival rate of these infants. The increased survival rate of infants with<unk>  in the 1970s and 80s may be indirectly due to the disability rights movement challenging perspectives around the worth of infants with a disability, as well as the Baby Doe Law. As of 2005, advances in the care of pregnant mothers and their babies have not resulted in a noticeable decrease in<unk> . This is generally attributed to medical advances in areas related to the care of premature babies (which results in a greater survival rate). Only the introduction of quality medical care to locations with less-than-adequate medical care has shown any decreases. The incidence of<unk>  increases with premature or very low-weight babies regardless of the quality of care. , there is a suggestion that both incidence and severity are slightly decreasing – more research is needed to find out if this is significant, and if so, which interventions are effective. Prevalence of<unk>  is best calculated around the school entry age of about 6 years, the prevalence in the U.S. is estimated to be 2.4 out of 1000 children.
Cerebral palsy
Lesch–Nyhan syndrome
Athetoid cerebral palsy
Angelman syndrome
Spastic cerebral palsy
Tardive dyskinesia  Tardive dyskinesia  1
Spina bifida
Snyder–Robinson syndrome