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Table 4 Maternal demographic characteristics recorded on birth certificates of northern California samplesa

From: Study of Use of Products and Exposure-Related Behaviors (SUPERB): study design, methods, and demographic characteristics of cohorts

  Northern California Family Cohort
  Source population Contacted Tier I Tier II Tier III
Number of households 11,850 1,955 499 186 30
Age   *b *b   
   Mean 28.7 30.8 31.6 31.7 30.3
Age group   *b *b   
   Under 25 years 27.8% 17.2% 13.4% 11.3% 16.7%
   25-34 years 52.4% 53.9% 53.3% 58.1% 56.7%
   35-44 years 19.5% 28.3% 33.1% 30.1% 26.7%
   45+ 0.3% 0.6% 0.2% 0.5% 0.0%
Education level   *b *b **c  
   0-8 years 8.3% 7.2% 4.6% 0.5% 0.0%
   9-11 years 12.8% 10.4% 6.4% 1.6% 6.7%
   12 years 25.9% 16.3% 12.6% 12.4% 10.0%
   13-15 years 19.9% 20.2% 21.0% 22.0% 10.0%
   16 years 17.7% 23.7% 24.6% 26.3% 33.3%
   >16 years 15.4% 22.3% 30.7% 37.1% 40.0%
Race/ethnicity d   *b *b   
   White 71.0% 71.3% 80.0% 79.6% 93.3%
   Asian 20.2% 23.6% 15.6% 16.2% 6.7%
   African American 6.5% 3.5% 3.6% 3.2% 0.0%
   Native American 0.7% 0.3% 0.2% 0.5% 0.0%
   Other/Missing 1.6% 1.3% 0.6% 0.5% 0.0%
Hispanic identification   *b *b **c  
   Latino 33.2% 24.1% 21.6% 11.9% 23.1%
   Non-Latino 66.5% 75.6% 78.2% 87.6% 76.9%
   Missing 0.3% 0.3% 0.2% 0.5% 0.0%
Place of birth   *b *b **c  
   USA 55.3% 56.8% 68.5% 76.3% 80.0%
   Mexico 18.4% 13.9% 10.6% 2.7% 6.7%
   Other 26.2% 29.2% 20.6% 21.0% 13.3%
   Missing 0.1% 0.1% 0.2% 0.0% 0.0%
Publicly funded delivery   *b *b   
   Yes 33.6% 21.5% 17.0% 8.6% 13.3%
   No 66.2% 78.4% 82.6% 91.4% 86.7%
   Missing 0.2% 0.2% 0.4% 0.0% 0.0%
  1. aAll households participated in Tier I: some also participated in either Tier II or Tier III. Data shown are column percents.
  2. bP value of comparison source population. cP Value of comparison to Tier 1 cohort.
  3. dAsian ethnicity includes Indian and Filipino. Native American includes Hawaiian, Aleut, Eskimo.
  4. * Indicates significance at the <0.0001 level.
  5. ** Indicates significance at the 0.0001 level.