Table 2.

Kitagawa decomposition of change in infant mortality, United States, 2007–2013.

Gestational age (weeks)	Contribution of GA distribution	Contribution of GA-specific mortality	Total	% of total change due to GA distribution	% of total change due to GA-specific mortality
22	−0.024	−0.003	−0.027	−88.1	−11.9
23	−0.046	−0.066	−0.112	−41.0	−59.0
24	−0.031	−0.077	−0.108	−28.7	−71.3
25	−0.018	−0.046	−0.064	−28.4	−71.6
26	−0.007	−0.043	−0.050	−14.0	−86.0
27	−0.008	−0.029	−0.037	−20.4	−79.6
28	−0.011	−0.034	−0.045	−24.1	−75.9
29	−0.007	−0.035	−0.042	−16.8	−83.2
30	−0.006	−0.008	−0.013	−42.7	−57.3
31	−0.004	−0.007	−0.012	−38.1	−61.9
32	−0.007	−0.011	−0.018	−38.1	−61.9
33	−0.005	0.002	−0.003	−179.5	79.5
34	−0.005	−0.002	−0.007	−68.5	−31.5
35	−0.019	−0.014	−0.033	−57.2	−42.8
36	−0.030	−0.012	−0.042	−72.1	−27.9
37	−0.018	−0.008	−0.027	−68.4	−31.6
38	−0.113	−0.019	−0.132	−85.3	−14.7
39	0.144	−0.065	0.079	181.9	−81.9
40	−0.025	−0.052	−0.077	−32.0	−68.0
41	−0.003	−0.024	−0.028	−11.9	−88.1
42	−0.004	−0.001	−0.005	−81.4	−18.6
>42	−0.003	0.001	−0.002	−137.0	37.0
TOTALS	−0.250	−0.554	−0.804	−31.1	−68.9

GA, gestational age