[Frequency and some mortality risk factors in the state of Hidalgo, Mexico, due to neural tube closure defects].

Objective: To calculate the risk of fetal death due to neural tube defects and estimate associated factors in the state of Hidalgo, Mexico.

Material And Methods: Data were abstracted from death certificates registered during 1990-1995 in the state of Hidalgo, Mexico. The design was a proportional mortality study, which is considered as a variant of the case control design.