TABLE 2

Demographic Characteristics of PFK Population

Variable2008–2010a (N = 418 447)2011–2013a (N = 437 876)
Age, yb17.514.8
 <1
 1–4 23.423.1
 5–12 36.638.5
 13–17 22.523.6
Female gender49.148.9
Ruralc33.132.3
 Urban
 Rural66.967.7
Median household income in zip code, $c40 325 (36 250–48 182)40 659 (36 418–49 731)
Percentage of adults ≥25 y old in zip code with a BS degreec10.2 (7.6–15.5)10.4 (7.7–15.5)
Percentage of subjects in zip code living below the poverty levelc19.2 (12.9–24.6)18.8 (12.8–24.6)
Percentage of children aged <5 y in zip code living below the poverty levelc34.7 (21.0–44.1)34.7 (21.0–44.1)
Enrollment continuity
 Continuous enrollment ≥24 mo, January 2008–September 201333.833.1
 Continuous enrollment <24 mo, January 2008–September 201321.724.4
 Discontinuous enrollment ≥24 mo, January 2008–September 201338.236.4
 Discontinuous enrollment <24 mo, January 2008–September 20136.36.1
Enrollment breaks
 No break in enrollment while enrolled, January 2008–September 201355.557.5
 1 break in enrollment while enrolled, January 2008–September 201328.026.9
 >1 break in enrollment while enrolled, January 2008–September 201316.515.6
  • BS, bachelor of science.

  • a Percentages and medians (interquartile ranges) are shown and are based on all PFK members who were aged 0 to 17 years at any point during the entire study period and who were enrolled for at least 1 month during the particular period indicated.

  • b Age was determined as of July 1, 2009, and July 1, 2012, for the 2008–2010 and 2011–2013 time periods, respectively.

  • c Based on the child’s zip code as of July 1, 2009, and July 1, 2012, for the 2008–2010 and 2011–2013 time periods, respectively. Zip code–level characteristics came from the 2007–2011 American Community Survey of the US Census Bureau. If a child was not covered by PFK on July 1, 2009, but was covered at some point during 2008–2010, the nearest date during 2008–2010 on which they were covered by PFK was used to determine these characteristics for the 2008–2010 period. If a child was not covered by PFK on July 1, 2012, but was covered at some point during 2011–2013, the nearest date during 2011–2013 on which they were covered by PFK was used to determine these characteristics for the 2011–2013 period.