Table 2.
Mean number of visits in which a claim was made per person year among adults with intellectual and developmental disability in Wisconsin Medicaid 2008–2018, by age category and case status
| ASD N=4,775 | ASD+ID N=2,738 | ID-only N=14,945 | DS N=3,484 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age category | YPT | Visits/YPT | 95% CI | YPT | Visits/YPT | 95% CI | YPT | Visits/YPT | 95% CI | YPT | Visits/YPT | 95% CI |
| 21–29 | 17,069 | 9.3 | 9.1, 9.4 | 7,641 | 14.4 | 14.1, 14.8 | 21,169 | 15.9 | 15.7, 16.2 | 5,985 | 8.1 | 7.9, 8.3 |
| 30–39 | 6,722 | 12.3 | 12.0, 12.6 | 5,597 | 16.0 | 15.5, 16.4 | 23,451 | 17.2 | 17.0 17.4 | 5,589 | 9.4 | 9.1, 9.7 |
| 40–49 | 2,952 | 15.2 | 14.6, 15.8 | 4,794 | 17.5 | 17.0, 18.1 | 25,554 | 17.8 | 17.5, 18.0 | 6,923 | 11.4 | 11.1, 11.7 |
| 50–59 | 1,684 | 17.3 | 16.4, 18.4 | 4,039 | 19.1 | 18.4, 19.7 | 28,927 | 19.8 | 19.6, 20.0 | 6,669 | 15.1 | 14.7, 15.5 |
| 60+ | 1,106 | 23.2 | 21.7, 24.8 | 2,521 | 23.2 | 22.2, 24.2 | 31,581 | 20.7 | 20.5, 21.0 | 2,720 | 19.1 | 18.3, 19.9 |
Group differences: Case, controlling for age; F= 1054.0, P<0.0001; DS<ASD<ASD+ID<ID only
Age category, controlling for case; F=898.6, P<0.0001; 21–29<30–39<40–49<50–59<60+
ASD: Autism spectrum disorder; ID: Intellectual disability; DS: Down syndrome; YPT: Years person time; ID-only: claims for ID without claims for ASD or DS
Estimates calculated using generalized linear regression with random intercept for subject and log number of visits as outcome. Model includes categorical age, case status, year of service, member gender, and age*case interaction term. Data presented are back-transformed.