Table 1.

Population demographics

	All (N=562)	DS+ASD (N=72)	DS-only (N=490)
Sex (n, %)
Male	316 (56.2%)	52 (72.2%)	264 (53.9%)
Diagnosis (n, %)
Trisomy 21	541 (96.3%)	66 (91.7%)	475 (96.9%)
Mosaic	8 (1.4%)	4 (5.6%)	4 (0.8%)
Translocation	10 (1.8%)	1 (1.4%)	9 (1.8%)
Unknown	3 (0.5%)	1 (1.4%)	2 (0.5%)
Age (years)
Median	10	11	10
IQR	7.74	8.14	7.47
Mean	10.39	11.74	10.19
Standard deviation	5.04	5.06	5.02
Race/ethnicity (n, %)
White	382 (68.0%)	46 (63.9%)	336 (68.6%)
Black	42 (7.5%)	5 (6.9%)	37 (7.6%)
Asian	20 (3.6%)	2 (2.8%)	18 (3.8%)
Native Alaskan/American Indian	0 (0%)	0 (0%)	0 (0%)
Pacific Islander/Native Hawaiian	1 (0.2%)	1 (1.4%)	0 (0%)
Multiple races reported	1 (0.2%)	0 (0%)	1 (0.2%)
Other	68 (12.1%)	13 (18.1%)	55 (11.2%)
No answer	48 (8.5%)	5 (6.9%)	43 (8.8%)
Primary language (n, %)
English	514 (91.5%)	69 (95.8%)	445 (90.8%)
Spanish	24 (4.3%)	2 (2.8%)	22 (4.5%)
Portuguese	8 (1.4%)	1 (1.4%)	7 (1.4%)
Other	14 (2.5%)	0 (0%)	13 (2.7%)
No answer	3 (0.5%)	0 (0%)	3 (0.6%)
Annual household income (n, %)
< $34,282	28 (5.0%)	4 (5.6%)	24 (4.5%)
$34,282–$54,850	217 (38.6%)	29 (40.3%)	188 (38.4%)
$54,850–$82,276	245 (43.6%)	33 (45.8%)	212 (43.3%)
>$82,276	70 (12.5%)	6 (8.3%)	64 (13.1%)
No answer	2 (3.6%)	0 (0%)	2 (0.4%)