Perinatal mortality following assisted reproductive technology treatment in Australia and New Zealand, a public health approach for international reporting of perinatal mortality

Table 3 Australian and New Zealand perinatal mortality following ART treatment by different international definitions of perinatal period

Perinatal period		Total births	Fetal deaths		Neonatal deaths		Perinatal mortality rate
From: gestational age weeks	To: days survived after birth	Number	Number	Cumulative percent	Number	Cumulative percent	Per 1000 births
≥ 20¹	< 28	50252	625	100.0	182	100.0	16.1
≥ 22	< 28	49981	416	66.6	135	74.2	11.0
≥ 24	< 28	49760	289	46.2	95	52.2	7.7
≥ 28	< 28	49212	223	35.7	53	29.1	5.6
≥ 20²	< 7	50252	625	100.0	157	100.0	15.6
≥ 22	< 7	49981	416	66.6	110	70.1	10.5
≥ 24	< 7	49760	289	46.2	73	46.5	7.3
≥ 28³	< 7	49212	223	35.7	39	24.8	5.3

¹Australian/New Zealand definition includes all live and stillbirths of ≥20 completed weeks of gestation and/or ≥400 grams of birthweight and death of a neonate <28 complete days after birth.
²ICMART defines the perinatal period as births of ≥20 completed weeks of gestation to <7 completed days after birth regardless of birthweight.
³WHO defines the perinatal period births of ≥28 completed weeks of gestation to <7 completed days after birth regardless of birthweight.

ISSN: 1471-2393