Answer by
pennysaver (21)
Spina bifida occulta used to be more common in the past and in underdeveloped countries. In Canada, the incidence rate is 1 in 1000 births. In the United States, because of better nutrition, the incidence rate has fallen from 4.3 in 10000 in 1987 to 1.9 in 10000 in 2005.