. 2007 Jul;97(7):1255–1260. doi: 10.2105/AJPH.2006.093708

TABLE 2—

Gestational Age–Specific Infant Mortality Rates, by Race: United States, 1990 and 2000

	Black			White			Black–White Rate Ratio
	1990	2000	% Change	1990	2000	% Change	1990	2000
Gestational Age
< 28 weeks	434.8	398.8	−8.3	494.7	413.6	−16.4	0.9	1.0
28–31 weeks	68.2	53.7	−21.2	83.5	59.3	−29.0	0.8	0.9^a
32–36 weeks	14.4	10.8	−24.6	13.8	9.7	−29.7	1.0	1.1^a
37–39 weeks	6.0	4.4	−26.5	3.8	2.7	−28.9	1.6	1.6^a
40 or 41 weeks	5.3	3.6	−30.7	2.8	1.9	−30.3	1.9	1.9^a
≥ 42 weeks	6.1	4.7	−23.1	3.8	2.6	−31.0	1.6	1.8^a
Total	14.1	11.3	−19.9	6.1	4.7	−22.6	2.3	2.4^a
All preterm	54.6	50.4	−7.6	41.3	29.9	−27.5	1.3	1.7
All term and postterm	5.8	4.2	−27.4	3.4	2.4	−28.3	1.7	1.7^a

Note. Infant mortality rates are per 1000 live births. All differences significant at P < .01 unless otherwise noted. ^aNot statistically significant, P > .05.