TABLE 1.

Autism Prevalence in Each Birth-Year Cohort According to Age (From USDE Data)

Birth-Year CohortAge, y
67891011121314151617
199737.6*
199630.0*35.1
199527.3*31.737.3
199423.4*27.632.237.4
199321.1*23.227.729.336.1
199219.1*21.823.927.830.533.7
199114.6*16.920.120.723.426.227.5
199011.5*13.416.016.818.020.420.922.7
19899.1*10.312.513.314.515.615.817.818.3
19887.3*8.610.110.911.813.412.514.015.716.2
19875.6*6.68.38.79.510.710.510.712.113.313.7
19865.5*6.87.57.88.98.99.69.710.711.611.5
19855.7*6.06.87.77.38.08.48.99.610.2
19844.9*5.36.15.96.26.87.27.27.7
19834.3*5.15.25.25.76.36.56.4
19823.9*3.84.44.54.95.45.2
19813.2*3.54.14.24.24.5
19803.5*3.13.53.53.5
19793.3*3.03.33.1
19783.1*2.72.8
19772.7*2.3
19762.4*
  • * There were no previous-year data for comparison.

  • Statistically significant (P < .05) change from the previous year.