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Table 2 Mean ages at events, National Survey of Children’s Health, 2016—2018

From: The diagnostic odyssey of autism: a cross-sectional study of 3 age cohorts of children from the 2016–2018 National Survey of Children’s Health

  N Weighted N Weighted % Age years (SE) p-valuea
First developmental services  
 Full sample 2164 1,502,230 100% 4.10 (0.10)  
 Early childhood 284 219,126 14.6% 2.48 (0.08) Ref
 Middle childhood 800 683,385 45.5% 3.98 (0.14)  < 0.001
 Adolescence 1080 599,719 40.0% 4.81 (0.17)  < 0.001
First intervention/education plan
 Full sample 2133 1,467,511 100% 4.43 (0.11)  
 Early childhood 260 202,267 13.8% 2.48 (0.09) Ref
 Middle childhood 779 666,613 45.4% 4.39 (0.18)  < 0.001
 Adolescence 1094 598,631 40.8% 5.14 (0.15)  < 0.001
First autism diagnosis
 Full sample 2303 1,598,915 100% 4.56 (0.13)  
 Early childhood 293 221,409 13.8% 2.38 (0.08) Ref
 Middle childhood 840 729,767 45.64% 4.26 (0.17)  < 0.001
 Adolescence 1170 647,739 40.5% 5.64 (0.22)  < 0.001
  1. aBolded p-values denote statistical significance at p < 0.05. All analyses were weighted to account for the complex survey design