Table 5. Trends in prevalence, demographic characteristics, and severity among children with vision impairment, 1991–2010.

	1991		1992		1993		1994		1996		2000		2002		2004		2006		2008		2010		1991–2010		Average annual percent change 1991–2010
	%	Prev	%	Prev	%	Prev	%	Prev	%	Prev	%	Prev	%	Prev	%	Prev	%	Prev	%	Prev	%	Prev	%	Prev
Total	n = 29	1.0	n = 41	1.4	n = 34	1.1	n = 36	1.1	n = 50	1.4	n = 48	1.1	n = 45	1.0	n = 57	1.3	n = 55	1.3	n = 73	1.6	N = 71	1.5	n = 539	1.3	1.60 (0.35, 2.86)
Demographics
White non-Hispanic	41.4	0.7	48.8	1.2	64.7	1.2	58.3	1.2	50.0	1.4	31.3	0.8	44.4	1.2	24.6	0.9	32.7	1.2	27.4	1.3	28.2	1.3	38.4	1.1	0.55 (-1.41, 2.55)
Black non-Hispanic	51.7	1.3	46.3	1.6	32.4	0.9	36.1	1.0	42.0	1.4	58.3	1.4	42.2	1.0	54.4	1.6	40.0	1.1	38.4	1.4	36.6	1.3	43.2	1.3	0.22 (-1.73, 2.21)
Male	44.8	0.9	61.0	1.6	61.8	1.3	52.8	1.1	58.0	1.6	62.5	1.4	46.7	1.0	52.6	1.4	58.2	1.5	47.9	1.5	56.3	1.6	54.7	1.4	1.21 (-0.53, 2.98)
Female	55.2	1.1	39.0	1.1	38.2	0.8	47.2	1.0	42.0	1.2	37.5	0.8	53.3	1.1	47.4	1.3	41.8	1.1	52.1	1.7	43.7	1.3	45.3	1.2	2.06 (0.39, 3.77)
Level of severity
Low vision	31.0	0.3	31.7	0.4	11.8	0.1	16.7	0.2	28.0	0.4	31.3	0.3	28.9	0.3	26.3	0.4	30.9	0.4	31.5	0.5	33.8	0.5	28.4	0.4	3.37 (0.54, 6.28)
Blindness	69.0	0.7	68.3	0.9	88.2	0.9	75.0	0.8	58.0	0.8	64.6	0.7	71.1	0.7	73.7	1.0	69.1	0.9	64.4	1.0	57.7	0.8	67.7	0.9	0.77 (-0.48, 2.05)
VI NOS*	nr	nr	nr	nr	nr	nr	nr	nr	14.0	0.2	nr	nr	nr	nr	nr	nr	nr	nr	nr	nr	8.5	0.1	3.9	0.05	N/A

*Proportions and prevalence estimates with numerators <5 children are suppressed due to small sample sizes.