Table 3.

Mean paid amount 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	Paid ($) /YPT	95% CI	YPT	Paid ($) /YPT	95% CI	YPT	Paid ($) /YPT	95% CI	YPT	Paid ($) /YPT	95% CI
<30	17,069	713.23	649.9, 782.7	7,641	3,957.23	3,485.6, 4,492.7	21,169	3,276.73	3,016.8, 3,559.1	5,985	1,041.38	902.3, 1,201.9
30–39	6,722	2,237.24	1,960.6, 2,552.9	5,597	10,898.71	9,577.4, 12,402.4	23,451	6,574.15	6,111.0, 7,072.4	5,589	2,416.08	2,134.5, 2,734.8
40–49	2,952	2,288.38	1,893.8, 2,765.1	4,794	13,823.15	11,916.6, 16,034.7	25,554	7,226.43	6,761.9, 7,722.9	6,923	3,202.86	2,876.5, 3,566.3
50–59	1,684	2,800.91	2,191.4, 3,579.9	4,039	20,266.00	16,937.4, 24,248.7	28,927	9,120.68	8,579.7, 9,695.8	6,669	5,907.63	5,315.4, 6,565.9
60+	1,106	9,037.16	6,547.8, 12,421.8	2,521	27,906.08	21,748.2, 35,807.5	31,581	11,514.93	10,835.9, 12,236.5	2,720	11,667.94	9,570.5, 14,225.0

Group differences: Case, controlling for age, year of service; F= 4890.9, P<0.0001; ASD < DS < ID only < ASD+ID

Age category, controlling for case, year of service; F=2702.55, 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. Cost in US dollars adjusted for inflation.

Estimates calculated using a generalized linear regression with random intercept for subject and log number of visits as outcome. Model includes categorical age, year of service, member gender, case status and age*case interaction term. Data presented are back-transformed.