Perinatal mortality rate includes?
|A|| Death within first week|
|B|| Abortions, still births and deaths in first week|
|C|| Death from 28 week to within the 1st wk of life|
|D||Within 1 month|
1. As currently defined, the term "perinatal mortality" includes both late foetal deaths (stillbirths) and early neonatal deaths. The Eighth Revision of the International Classification of Diseases (ICD) defined the "perinatal period" as lasting from the 28th week of gestation to the seventh day after birth. The Ninth Revision (1975) of ICD added that:
2. i) Babies chosen for inclusion in perinatal statistics (this means late foetal deaths, live births and early neonatal deaths) should be those above a minimum birth weight, i.e., 1000 g at birth (A birth weight of 1000 g is considered equivalent to gestational age of 28 weeks)
3. ii) if the birth weight is not available, a gestation period of at least 28 weeks should be used
4. iii) where (i) and (ii) are not available, body length (crown to heel) of at least 35 cm should be used. But the preferred criterion is birth weight.
5. PMR = ([Late foetal deaths (28 weeks gestation and more) + early neonatal deaths (first week) in one year] / Live births in the same year) X 1000
6. There is a difference in denominator of the perinatal mortality rate defined by the WHO and industrially developed nations. This makes international comparisons difficult.
International comparisons –
- For international comparisons, a more precise formulation is: "Late foetal and early neonatal deaths weighing over 1000 g at birth expressed as a ratio per 1000 live births weighing over 1000 g at birth". It is calculated as
- Perinatal mortality rate = (Late foetal and early neonatal deaths weighing over 1000 g at birth / Total live births weighing over 1000 g at birth) X 1000