Table 1.

Percentage and incidence rate of mortality among newborns according to birth weight strata in the municipality of Porto Alegre (2000–2015)

Total	Mortality						P	IR	CI 95%
	No		Yes		Total
	N	%	N	%	N	%
500–999 g	596	45.0	729	55.0	1325	100	< 0.001	207.04	186.81	229.47
1000–1499 g	1884	89.1	231	10.9	2115	100	< 0.001	41.1	35.31	47.83
1500—2499 g	19,536	98.5	304	1.50	19,840	100	< 0.001	5.76	4.99	6.65
2500—2999 g	64,032	99.5	319	0.50	64,351	100	< 0.001	1.86	1.61	2.15
3000—3999 g	17,5275	99.7	467	0.30	175,742	100	< 0.001	1	─	─
≥ 4000 g	14,571	99.7	38	0.30	14,609	100	0.899	0.97	0.7	1.36
Total	275,894	99.2	2088	0.80	277,982	100	─	─	─	─