Table 6.

Prevalence of astigmatism (≥ 1 diopter cylinder) by race-ethnicity, gender, and age, NHANES 1999–2004.

	Prevalence and 95% CI* for ages:
	20–39 years	40–59 years	60 years and older	20 years and older	40 years and older
Total	23.1	27.6	50.1	36.2	31.0
	21.6–24.5	25.8–29.3	48.2–52.0	34.9–37.5	30.1–32.0
Males	24.1	28.4	54.9	38.6	32.8
	22.2–26.0	26.0–30.8	52.3–57.4	36.8–40.3	31.7–33.9
Females	22.1	26.8	46.1	34.2	29.48
	20.1–24.0	24.6–29.0	43.1–49.2	32.3–36.1	28.0–30.8
Non–Hispanic	24.5	29.7	49.8	37.4	32.3
black	21.2–27.9	27.2–32.3	44.9–54.7	34.8–40.1	30.2–34.5
Males	24.8	30.3	54.5	39.6	33.7
	20.7–29.0	25.1–35.5	47.5–61.4	35.6–43.5	30.4–37.0
Females	24.3	29.3	46.5	35.9	31.3
	19.9–28.7	24.6–33.9	40.6–52.4	32.1–39.6	28.8–33.8
Non–Hispanic	22.8	27.9	50.4	36.5	31.1
white	20.5–25.0	25.8–29.9	48.2–52.6	35.0–38.0	29.8–32.3
Males	24.3	28.4	55.5	38.8	33.1
	21.5–27.2	25.4–31.4	52.8–58.2	36.6–40.9	31.6–34.6
Females	21.2	27.4	45.9	34.5	29.2
	18.4–23.9	24.8–30.0	42.4–49.4	32.2–36.7	27.4–31.0
Mexican	21.5	27.1	51.3	36.4	30.5
American	18.8–24.2	24.6–29.5	49.0–53.6	34.7–38.0	28.7–32.3
Males	20.3	26.5	59.2	39.0	31.6
	16.9–23.6	22.6–30.4	54.5–63.7	35.9–42.1	29.0–34.2
Females	23.1	27.7	44.2	34.0	29.7
	18.9–27.3	23.7–31.8	40.4–48.0	31.5–36.6	27.2–32.2
Other	24.5	23.2	47.1	32.4	29.2
	19.0–30.0	17.5–29.0	37.1–57.0	27.4–37.4	25.1–33.4
Males	25.6	27.4	44.2	33.8	30.6
	19.2–32.0	17.9–36.9	31.6–56.7	26.7–41.0	25.5–35.6
Females	23.3	20.2	49.2	31.3	28.2
	16.4–30.2	13.3–27.1	37.4–60.8	24.8–37.8	23.4–32.9

^*CI: Confidence interval.