Table 1.

Distribution and Mean ± SD Age of Children With DS and Nystagmus (DSN) and Without Nystagmus (DS) in Each Age Group

	Age
Characteristic	1–11.9 Months	12–23.9 Months	2–3.9 Years	4–5.9 Years	6–7.9 Years	8–9.9 Years	10–11.9 Years
DSN
Number	8	9	9	9	5	5	5
Age, mean ± SD, y	0.59 ± 0.25	1.48 ± 0.30	2.88 ± 0.47	5.15 ± 0.56	6.92 ± 0.46	8.44 ± 0.35	11.11 ± 0.79
DS
Number	38	35	25	23	23	14	18
Age, mean ± SD, y	0.56 ± 0.23	1.45 ± 0.28	2.78 ± 0.58	4.95 ± 1.05	6.81 ± 0.69	8.86 ± 1.21	10.53 ± 0.47