Table 1.

Characteristics of participants aged 20 years and older reporting to the Mobile Examination Center, NHANES 1999–2004.

	Complete refractive error data (n=12,010)			Incomplete refractive error data (n=2,203)
Characteristic	N	%	95% CI*	N	%	95% CI
Age
20–39	4653	41.6	39.9–43.3	415	24.6	21.6–27.5
40–59	3776	39.4	38.0–40.8	385	27.6	25.2–30.1
60+	3581	19.0	17.8–20.2	1403	47.8	44.4–51.2
Gender
Female	6220	51.2	50.5–52.0	1258	58.8	55.4–62.2
Male	5790	48.8	48.0–49.5	945	41.2	37.8–44.6
Race-ethnicity
Non-Hispanic black	2343	10.6	8.6–12.6	404	13.2	10.3–16.0
Mexican American	2728	7.1	5.4–8.7	479	9.6	7.2–12.1
Non-Hispanic white	5841	71.8	68.5–75.1	1160	68.0	64.0–72.0
Other†	998	10.4	7.9–13.0	160	9.2	6.2–12.1
Education
Less than High School	3682	19.9	18.6–21.2	968	26.6	23.9–29.3
High School	2899	26.5	24.9–28.0	472	24.8	21.7–27.9
Some college	5413	53.6	51.6–55.7	747	48.6	44.8–52.3
Income
Below poverty level	1985	13.3	11.9–14.7	445	17.5	14.6–20.4
At or near poverty level	2810	20.8	19.1–22.4	619	23.2	20.9–25.5
Above (2x) poverty level	6212	65.9	63.4–68.4	882	59.2	55.2–63.3
Health insurance, < 65 yrs
Uninsured	2411	19.8	18.2–21.5	249	18.6	15.7–21.5
Private (± other coverage)	5818	70.7	68.6–72.8	523	65.8	61.7–70.0
Medicaid (no private coverage)	634	4.6	3.8–5.4	101	9.3	6.8–11.7
Medicare/other federal	403	4.9	4.0–5.7	60	6.3	4.3–8.3
Health insurance, >=65 yrs
Uninsured	62	1.0	0.5–1.4	21	1.0	0.4–1.6
Private only	224	8.4	6.4–10.5	80	6.0	3.8–8.3
Private + Medicare	986	46.0	42.6–49.3	452	42.8	38.9–46.7
Medicare ± other federal	1148	42.5	39.3–45.8	630	47.4	43.5–51.2
Medicaid and/or other federal	98	2.1	1.4–2.8	45	2.8	1.3–4.3

^*CI: Confidence interval.

^†”Other”: persons reporting their race-ethnicity as Chinese, Japanese, Korean, Asian Indian, Southeast Asian, Native American, Pacific Islander, non-Mexican-American Hispanic, or multiracial.