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. 2010 Jun 1;33(6):745–752. doi: 10.1093/sleep/33.6.745

Table 1.

Demographic characteristics for the sample in comparison to tri-county census data, 2005-2007

Characteristic Study sample N = 618 Detroit Metropolitan Statistical Area^ N = 1,585,163
    Gender, %
        Male 48.5 48.9
        Female 51.5 51.1
    Age, y
        18 to 24 11.7 13.3
        25 to 34 21.7 19.8
        35 to 44 24.3 24.4
        45 to 54 25.3 24.9
        55 to 64 16.9 17.7
    Race, %
        Caucasian 63.2 71.7
        African American 30.6 23.1
        Asian/Pacific Islander 2.0 3.2
        Native American 0.7 0.3
        Other 3.5 1.7
    Household income, $ (in thousands)
        < 10 7.8 7.7
        10 to < 15 4.2 5.1
        15 to < 25 13.0 10.2
        25 to < 35 12.1 10.4
        35 to < 50 15.1 13.6
        50 to < 75 21.8 18.6
        > 75 26.1 34.4
^

Data are from the U.S. Bureau of the Census, 2005-2007. Age percentages based on only individuals ages 18-65. The percentage by age groups was calculated from a total of 1,585,163 individuals, which represented the total population between 18 and 65 years old.