Mortality in Extremely Low-Birth-Weight Neonates in México City (1985–2009)

Table 1

Characteristics of ELBW neonates across 5-year periods.

		1985–1989	1990–1994	1995–1999	2000–2004	2005–2009	𝑃-Value
		𝑛=43	𝑛=22	𝑛=16	𝑛=20	𝑛=57
Sex
	Male	23 (53.5%)	10 (45.5%)	8 (50%)	9 (45%)	25 (43.8%)	.90
	Female	20 (46.5%)	12 (54.5%)	8 (50%)	11 (55%)	32 (56.2%)
Gestation
	Single	21 (48.8%)	14 (63.6%)	10 (62.5%)	14 (70%)	34 (59.6%)	.09
	Twin	22 (51.2%)	5 (22.7%)	5 (31.3%)	6 (30%)	21 (36.8%)
	Multiple	0	3 (13.6%)	1 (6.3%)	0	2 (3.6%)
Weeks of gestational age
21		1	0	0	1	2	.17
22		1	1	0	0	1
23		4	1	2	2	3
24		2	3	0	3	4
	21–24	8 (18.6%)	5 (22.7%)	2(12.5%)	6 (30%)	10 (17.5%)
25		5	3	2	1	7
26		7	2	2	0	4
27		6	1	0	3	5
28		4	2	3	2	7
29		10	2	1	4	5
30		4	3	5	4	9
	25–30	34 (79.1%)	13(59.1%)	13(81.3%)	14 (70%)	37 (64.9%)
31		0	1	0	0	2
32		1	1	0	0	3
34		0	1	0	0	4
	31–34	1 (2.3%)	13(13.6%)	0 (0%)	0 (0%)	9 (15.7%)
35		0	1	0	0	1
37		0	0	1	0	0
	36–37	(0%)	1 (4.5%)	1 (6.3%)	0 (0%)	1 (2.5%)
Transfers
	<8 days	3 (6.9%)	0	0	2 (10%)	1 (2.5%)	.28
	≥8 days	0	0	0	0	1 (2.5%)

∗Chi-Square Pearson test