TABLE 1

Demographic Characteristics of Study Participants

Characteristics19952000200320062009
N%N%N%N%N%
Total83551008412100.08879100.08926100.08496100.0
Gender
 Boy409949.1418549.8444850.1455451.0424950.0
 Girl425650.9422750.3441549.7437249.0424750.0
 Unreported a 160.2
Day care/school status
 In day care/school794995.3789593.9838994.5852395.5820296.5
 Not in day care/school3884.75096.14725.33824.32723.2
 Unreported a 20.2210.2220.3
Race/ethnicity
 Asian108013.1122614.7137415.5130714.6127815.0
 African American89510.87689.28419.57888.86828.0
 Hispanic123314.9122814.8117313.2130014.6120614.2
 White411149.7411049.4426848.1417046.7393446.3
 Multiracial86210.492911.2102311.5118113.2120014.1
 Other941.1510.6500.6871.0901.1
 Unreported a 1501.7931.01061.3
Parents’ years of school
 Mother
  ≤12 y309237.7270632.9257329241527.1231827.3
  >12 y510962.3552767.1609668.7636671.3589369.4
  Unreported a 2102.41451.62853.4
 Father
  ≤12 y293736.7266033.0262929.6275430.9199123.4
  >12 y506963.3540367.0584365.8589466.0632374.4
  Unreported a 4074.62783.11822.1
  • a Not all categories were documented for all survey members. Some participants declined to answer a particular question.