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Table 1 Characteristics of mothers and US infants born 2007–2010

From: State-level income inequality and mortality among infants born in the United States 2007–2010: A Cohort Study

Individual Level Characteristics n Percentage
Birth year
 2007 4,173,087 25.9
 2008 4,109,463 25.5
 2009 3,993,282 24.7
 2010 3,869,884 24.0
Mother’s Race
 non-Hispanic white 8,640,230 53.5
 non-Hispanic black 2,383,748 14.8
 American Indian 159,375 1.0
 Asian 927,957 2.7
 Hispanic 3,960,440 24.5
 Other 73,965 0.5
Education
 Less than high school 3,288,457 20.4
 High School 4,468,279 27.7
 Post-secondary 8,388,980 52.0
Marital Status
 Single 6,579,444 40.8
 Married 9,566,272 59.3
Birth order
 First 5,378,396 33.3
 Second 4,539,641 28.1
 Third 2,918,817 18.1
 Fourth or more 3,308,862 20.5
Nativity
 Foreign-born 3,855,491 23.9
 US Born 12,290,225 76.1
US State-Level Characteristics 2010 Mean (SD) Min, Max
Gini 0.45 (0.20) (0.42, 0.53)
Change in Gini 1990–2010 0.06 (0.01) (0.04, 0.10)
Median Income, USD 49,973.65 (8130.60) (36,851, 68,854)
Population, 2010 6,054,080 (6824211) (563,767, 37,300,000)
non-Hispanic black (%) 12 (11.8) (0.40, 0.55)
Proportion in poverty (%) 14.8 (3.1) (8.3, 22.4)