BMC Pregnancy and Childbirth

Table 3 Number of neonatal deaths, number of babies, and absolute risk according to achieved birth weight and birth weight ratio & among 411957 (including 946 neonatal deaths) second-born babies (Denmark, 1979–2002)

From: Assessing fetal growth impairments based on family data as a tool for identifying high-risk babies. An example with neonatal mortality

Birth Weight Ratio &		Achieved birth weight
		<1500 g	1500–1999 g	2000–2499 g	2500–2999 g	3000–3499 g	3500–3999 g	>= 4000 g	Total
< 50%	Deaths	60	14	0	0	0	0	0	74
	Babies	137	35	0	0	0	0	0	172
	Absolute risk †	437.96	400.00	-	-	-	-	-	430.23
50–60%	Deaths	22	20	8	0	0	0	0	50
	Babies	120	184	89	1	0	0	0	394
	Absolute risk †	183.33	108.70	89.89	-	-	-	-	126.90
60–70%	Deaths	15	9	24	6	0	0	0	54
	Babies	133	327	923	287	7	0	0	1677
	Absolute risk †	122.78	27.52	26.00	20.91	-	-	-	32.20
70–80%	Deaths	23	14	34	36	5	0	0	112
	Babies	205	374	2182	6585	1473	24	0	10843
	Absolute risk †	112.20	37.43	15.58	5.47	3.39	-	-	10.33
80–90%	Deaths	27	20	16	47	59	7	0	176
	Babies	203	460	1995	18662	32431	4355	58	58164
	Absolute risk †	133.01	43.48	8.02	2.52	1.82	1.61	-	3.03
90–110% *	Deaths	35	31	30	40	100	91	32	359
	Babies	368	779	2009	12331	88402	125576	39621	269086
	Absolute risk †	95.11	39.80	14.93	3.24	1.13	0.72	0.81	1.33
110–120%	Deaths	17	8	7	7	5	17	19	80
	Babies	90	139	351	706	3208	16228	34574	55296
	Absolute risk †	188.89	57.55	19.94	9.92	1.56	1.05	0.55	1.45
>= 120%	Deaths	5	6	6	6	4	5	9	41
	Babies	30	121	191	346	702	2268	12667	16325
	Absolute risk †	166.67	49.59	31.41	17.34	5.70	2.20	0.71	2.51
Total	Deaths	204	122	125	142	173	120	60	946
	Babies	1286	2419	7740	38918	126223	148451	86920	411957
	Absolute risk †	158.63	50.43	16.15	3.65	1.37	0.81	0.69	2.30

& Achieved birth weight divided by predicted birth weight times 100
† Crude absolute risk of neonatal death per 1000 babies.
* Babies who achieved their predicted birth weight within +/- 10%.
- indicates that the data were too sparse to provide a reliable estimate

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ISSN: 1471-2393

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