The true incidence of
Munchausen syndrome by proxy (MSBP) is unknown. The
number of male and female victims are about equal.
Children subjected to MSBP are most often younger than 6 years old.
However, MSBP has also involved older children, including teens. Older children
and teens subjected to this syndrome may co-operate with the offending
caregiver; for example, they may tell health professionals what the caregiver
has told them to say or they may truly believe they have an illness.
Often several children in one family will be victims of MSBP,
although usually the caregiver with MSBP abuses only one child at a time.
The long-term effects on victims of MSBP vary depending on the
severity of abuse and the treatment. Some children die from the abuse, although
the exact number is difficult to determine.