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. Author manuscript; available in PMC: 2026 Jan 1.
Published in final edited form as: Epidemiology. 2024 Sep 24;36(1):66–75. doi: 10.1097/EDE.0000000000001789

Table 1.

Characteristics of adults with claims for Down Syndrome in Medicaid, 2011–2019

Down Syndrome Random Sample
N= 119,325 Person–years: 796,984 N= 3,055,494 Person–years: 11,995,827
Deaths N= 19,335 N=144,015
Hospitalizations Mean=1.14 per year
SD=2.9, Median=0, IQR=1
Mean=0.65 per year
SD=2.6, Median=0, IQR=1
Age at First Claim (years), n(%) 18–25
26–34
35–44
45–54
55–64
65–89
42,643 (36)
20,586 (17)
19,096 (16)
22,573 (19)
12,065 (10)
2,362 (2)
1,047,252 (34)
566,367 (19)
416,024 (14)
366,986 (12)
331,776 (11)
327,089 (11)
Race, n(%) a White
Black
Pacific Islander
Asian
Native American
Mixed
89,081 (75
16,835 (14)
1,256 (1)
4,032 (3)
1,035 (1)
7,086 (6)
1,873,446 (61)
723,538 (24)
67,045 (2)
187,571 (6)
39,711 (1)
164,183 (5)
Ethnicity, n(%) b Non-Hispanic/Latino
Hispanic/Latino
99,444 (83)
19,881 (17)
2,424,101 (79)
631,393 (21)
Sex, n(%) Male
Female
61,473 (52)
57,852 (49)
1,338,581 (44)
1,716,913 (56)
Region, n(%) Northeastern
Midwest
South
West
Other/US territory
26,711 (22)
27,615 (23)
38,175 (32)
26,200 (22)
622 (1)
612,522 (20)
615,027 (20)
1,019,754 (33)
764,493 (25)
43,691 (1)
Eligibility Type (Ever), n(%) Disability
Income
96,879 (81)
56,175 (47)
745,606 (24)
1,644,528 (53)
Ever dual enrollment with Medicare, n(%)



Person years
Yes
No

Mean, (SD)
Median, (IQR)
71,086 (60)
48,239 (40)

3.80, (4)
6.0 (0, 8)
680,356(22)
2,375,138 (78)

3.92 (3)
3(0, 4)
a

DS missing race pre imputation: 23,041 (24%); Random sample missing race: 71,356 (30%)

b

Missing ethnicity pre imputation: 14,438 (12%); Random sample missing ethnicity 31,979 (13%)