Table 1.
Comparison of Hazard and Cumulative Incidence Distributions Derived From Two National Surveys
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|---|---|---|---|---|
| Any ASD | ASD described as “mild” | ASD described as “moderate” | ASD described as “severe” | |
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| Frequency | ||||
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| NSCH | 1,615 | 889 | 537 | 189 |
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| NS-CSHCN | 3,037 | 1,587 | 1,092 | 358 |
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| Cumulative incidence by 17 y | ||||
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| NSCH | 2.47% | 1.39% | 0.82% | 0.26% |
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| NS-CSHCN, adjusted | 1.82% | 0.91% | 0.66% | 0.26% |
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| RR | 1.4 | 1.5 | 1.2 | 1.0 |
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| Median age of 1st identification, y | ||||
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| NSCH | 6 | 7 | 5 | 3 |
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| NS-CSHCN, adjusted | 4 | 4 | 4 | 3 |
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| Difference | 2 | 3 | 1 | 0 |
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| Mean age of 1st identification, y | ||||
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| NSCH | 7.4 | 8.6 | 6.3 | 4.5 |
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| NS-CSHCN, adjusted | 5.4 | 5.6 | 5.5 | 3.7 |
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| Difference | 2 | 3 | 0.8 | 0.8 |
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| Proportion identified < 3 y | ||||
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| NSCH | 17% | 12% | 19% | 32% |
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| NS-CSHCN, adjusted | 23% | 20% | 24% | 34% |
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| Proportion identified 3–5 y | ||||
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| NSCH | 32% | 27% | 35% | 47% |
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| NS-CSHCN, adjusted | 44% | 44% | 42% | 48% |
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| Proportion identified 6–8 y | ||||
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| NSCH | 22% | 21% | 28% | 8% |
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| NS-CSHCN, adjusted | 18% | 22% | 17% | 9% |
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| Proportion identified >8 y | ||||
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| NSCH | 29% | 39% | 18% | 13% |
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| NS-CSHCN, adjusted | 15% | 14% | 17% | 10% |
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Note. ASD = Autism Spectrum Disorder; NSCH = National Survey of Children’s Health; NS-CSHCN = National Survey of Children with Special Health Care Needs; RR = risk ratio.