TABLE 4—

Gestational Age–Specific Components of the Black–White Neonatal and Postneonatal Mortality Disparity: United States, 1990 and 2000

	1990				2000
	Distribution Differencea	Rate Differencea	Total Mortality Differenceb	% of Disparity	Distribution Differencea	Rate Differencea	Total Mortality Differenceb	% of Disparity
Neonatal mortality disparity
Gestational Age
< 28 weeks	435.5	−59.5	376.0	76.2	373.6	−28.5	345.1	81.5
28–31 weeks	82.7	−27.2	55.5	11.2	45.1	−11.6	33.5	7.9
32–36 weeks	51.4	−23.7	27.7	5.6	25.9	−10.7	15.2	3.6
37–39 weeks	3.5	14.9	18.4	3.7	−1.9	19.2	17.3	4.1
40 or 41 weeks	−13.9	23.3	9.4	1.9	−4.7	11.9	7.1	1.7
≥ 42 weeks	−2.5	9.2	6.6	1.3	−0.1	5.5	5.4	1.3
Total	556.7	−63.1	493.6	100.0	437.9	−14.2	423.7	100.0
All preterm	569.6	−110.4	459.2	93.0	444.6	−50.8	393.8	92.9
All term and postterm	−12.9	47.4	34.4	7.0	−6.7	36.6	29.9	7.1
Postneonatal mortality disparity
Gestational Age
< 28 weeks	49.6	4.6	54.2	17.6	45.6	14.2	59.8	25.6
28–31 weeks	31.5	6.4	37.8	12.3	18.4	5.0	23.3	10.0
32–36 weeks	51.4	29.5	80.9	26.4	23.4	22.1	45.5	19.5
37–39 weeks	7.7	78.1	85.8	28.0	−3.0	65.4	62.4	26.7
40 or 41 weeks	−27.9	64.0	36.1	11.7	−10.0	42.8	32.8	14.0
≥ 42 weeks	−4.5	16.7	12.2	4.0	−0.1	9.8	9.7	4.2
Total	107.8	199.3	307.1	100.0	74.3	159.3	233.6	100.0
All preterm	132.5	40.4	173.0	56.3	87.4	41.3	128.7	55.1
All term and postterm	−24.7	158.8	134.1	43.7	−13.1	118.0	104.9	44.9

Note. The neonatal and postneonatal mortality disparity is based on excess deaths per 100 000 live births.

^aExcess deaths per 100 000 live births among Black infants because of a greater gestational age–specific proportion or mortality rate among Black infants. Negative numbers indicate excess deaths among White infants because of a lower gestational age–specific proportion or mortality rate among Black infants.

^bSum of excess deaths per 100 000 live births among Black infants because of differences in the gestational age–specific proportion and mortality rate.