In 1979 Istat, according to the law 194/78 on voluntary abortion, started two surveys: one on miscarriages and one on induced abortions. The first one collects data on miscarriages for which it is necessary the hospitalization of the woman, both in public or private hospitals. This means that the survey does not consider events in which there isn't any medical intervention or events that need only ambulatory care.
Data are collected using an individual and anonymous form (Istat D.11) that contains information about the woman and her pregnancy, and about the abortion.
The first ones contain: date of birth; place of birth and place of residence; citizenship; marital status; educational level; work status (a woman has a "not occupational status" if she is an housewife, or a student, or a retired person, or if she is looking for the first job. A woman has an "occupational status" if she is actually working or if she is unemployed e.g. she lost a previous job and she's looking for a new one); professional position; branch of economic activity; past reproductive history (number of live births, stillbirths, miscarriages, voluntary abortions); weeks of amenorrhea; recourse to assisted reproductive techniques.
Information about the event are the following: date and place of miscarriage; cause, type of operation, type of anaesthesia; type of hospitalization; length of stay in hospital; complications.