Table 1—

Crude and standardized* prevalence of previously diagnosed diabetes, undiagnosed diabetes (based on FPG and 2-h glucose from an OGTT), total undiagnosed diabetes, total diabetes, and proportion of total diabetes that is undiagnosed by age, sex, and race/ethnicity, NHANES 2005–2006

Diagnosed diabetesUndiagnosed diabetes
Total diabetes (diagnosed and undiagnosed by FPG or OGTT)Proportion of total diabetes that is undiagnosed§
FPGOGTTTotal (FPG or OGTT)
n3,1783,1782,8062,8062,8062,806
Crude prevalence
    Combined age-groups (years)
≥126.7 (5.8–7.7)2.1 (1.1–3.2)4.2 (3.0–5.5)4.4 (3.1–5.7)11.1 (9.3–13.0)39.7 (32.8–46.6)
≥207.7 (6.7–8.8)2.5 (1.2–3.7)4.9 (3.4–6.4)5.1 (3.6–6.6)12.9 (10.8–14.9)39.8 (32.9–46.6)
≥6517.0 (14.9–19.0)6.6 (2.7–10.5)14.3 (9.6–19.0)14.6 (10.0–19.2)31.6 (25.7–37.6)46.2 (39.3–53.1)
    Age-specific groups (years)
12–190.2 (0.0–0.5)0.1 (0.0–0.1)0.00.1 (0.0–0.2)0.3 (0.0–0.6)#
20–392.1 (1.5–2.8)0.8 (0.2–1.3)0.9 (0.4–1.4)1.0 (0.4–1.6)3.1 (2.4–3.9)32.5 (16.7–48.2)
40–597.9 (6.3–9.5)1.9 (0.4–3.4)4.2 (1.8–6.5)4.5 (2.1–6.9)12.4 (9.0–15.8)36.1 (24.5–47.8)
60–7417.6 (14.9–20.3)6.7 (2.1–11.4)12.4 (6.7–18.2)12.8 (7.1–18.4)30.0 (23.0–37.0)42.6 (32.1–53.1)
≥7514.9 (11.1–18.8)5.4 (1.1–9.8)13.4 (9.3–17.5)13.4 (9.3–17.5)29.1 (24.8–33.3)46.0 (34.6–57.5)
    Sex by age (years)
Men
    ≥126.2 (4.9–7.5)2.9 (1.1–4.6)4.2 (2.3–6.0)4.5 (2.6–6.4)10.7 (8.1–13.2)41.9 (30.9–53.0)
    ≥207.2 (5.7–8.7)3.3 (1.3–5.3)4.9 (2.8–7.0)5.2 (3.0–7.4)12.4 (9.6–15.2)42.0 (31.2–52.8)
Women
    ≥127.2 (5.7–8.7)1.5 (0.5–2.4)4.3 (2.9–5.7)4.4 (2.8–5.9)11.6 (9.1–14.1)37.8 (29.1–46.5)
    ≥208.3 (6.5–10.0)1.7 (0.6–2.8)4.9 (3.3–6.5)5.0 (3.3–6.8)13.3 (10.5–16.1)37.9 (29.1–46.6)
    Race/ethnicity by age (years)
Non-Hispanic white
    ≥125.8 (4.6–7.1)2.3 (0.8–3.7)4.8 (3.0–6.6)4.9 (3.0–6.8)10.7 (8.2–13.3)45.8 (36.4–55.3)
    ≥206.6 (5.3–7.9)2.6 (0.9–4.2)5.5 (3.4–7.5)5.6 (3.5–7.7)12.2 (9.4–15.0)46.0 (36.7–55.2)
Non-Hispanic black
    ≥1210.6 (8.9–12.4)2.6 (1.3–3.8)2.9 (1.9–3.9)3.4 (1.5–5.3)14.1 (11.5–16.6)24.2 (13.4–34.9)
    ≥2012.8 (10.6–15.1)3.1 (1.7–4.5)3.5 (2.4–4.6)4.1 (2.0–6.2)17.0 (14.4–19.7)24.2 (13.4–35.0)
Mexican American
    ≥126.9 (5.1–8.8)2.9 (1.1–4.8)4.6 (1.8–7.5)5.3 (2.4–8.1)12.2 (8.0–16.4)43.1 (32.2–54.1)
    ≥208.4 (6.3–10.6)3.5 (1.1–5.8)5.7 (2.2–9.2)6.3 (2.7–9.9)14.7 (9.5–20.0)43.0 (31.5–54.6)
Standardized* prevalence
    Combined age-groups (years)
≥126.6 (5.8–7.3)2.1 (1.2–3.0)4.1 (3.0–5.3)4.3 (3.2–5.4)10.9 (9.5–12.3)#
≥207.6 (6.7–8.5)2.4 (1.4–3.5)4.8 (3.5–6.1)5.0 (3.7–6.3)12.6 (10.9–14.3)34.2 (26.3–42.1)
≥6516.9 (14.8–19.0)6.6 (2.7–10.5)14.1 (9.5–18.7)14.4 (9.9–18.9)31.4 (25.3–37.4)45.6 (39.0–52.3)
    Age-specific groups (years)
12–190.2 (0.0–0.5)0.1 (0.0–0.1)0.00.1 (0.0–0.1)0.3 (0.0–0.6)#
20–392.1 (1.5–2.8)0.7 (0.2–1.3)0.9 (0.4–1.4)1.0 (0.4–1.5)3.1 (2.4–3.8)25.9 (16.2–35.7)
40–597.9 (6.3–9.5)1.9 (0.4–3.4)4.2 (1.8–6.5)4.5 (2.1–6.9)12.4 (9.0–15.8)36.1 (24.4–47.9)
60–7417.5 (14.8–20.3)6.8 (2.0–11.5)12.4 (6.6–18.3)12.8 (7.1–18.5)29.9 (22.9–37.0)42.7 (32.0–53.3)
≥7514.8 (11.1–18.5)5.7 (1.4–10.0)13.2 (9.3–17.2)13.2 (9.3–17.2)28.8 (24.6–32.9)45.8 (35.1–56.5)
    Sex by age (years)
Men
    ≥126.3 (4.9–7.6)2.9 (1.3–4.6)4.3 (2.6–6.0)4.6 (2.9–6.3)10.9 (8.8–13.0)#
    ≥207.3 (5.8–8.8)3.4 (1.5–5.3)5.0 (3.0–6.9)5.3 (3.3–7.3)12.6 (10.1–15.0)45.1 (33.5–56.8)
Women
    ≥126.8 (5.5–8.1)1.4 (0.5–2.3)3.9 (2.7–5.2)4.0 (2.7–5.4)10.8 (8.9–12.8)#
    ≥207.9 (6.4–9.3)1.6 (0.5–2.6)4.6 (3.1–6.0)4.7 (3.1–6.3)12.5 (10.3–14.8)**
    Race/ethnicity by age (years)
Non-Hispanic white
    ≥125.2 (4.3–6.1)2.0 (0.8–3.2)4.2 (2.7–5.7)4.3 (2.8–5.9)9.5 (7.7–11.4)#
    ≥206.0 (5.0–7.0)2.3 (0.9–3.7)4.9 (3.1–6.6)5.0 (3.2–6.8)11.0 (8.8–13.2)37.5 (22.7–52.4)
Non-Hispanic black
    ≥1212.0 (10.4–13.7)3.0 (2.0–4.0)3.5 (2.5–4.6)4.1 (2.3–5.8)16.1 (14.7–17.6)#
    ≥2013.9 (12.0–15.9)3.5 (2.3–4.7)4.1 (2.9–5.3)4.7 (2.7–6.8)18.7 (17.0–20.4)18.5 (9.8–27.2)
Mexican American
    ≥1210.9 (8.7–13.1)3.2 (1.7–4.7)6.0 (4.0–8.0)6.5 (4.7–8.4)17.4 (13.9–21.0)#
    ≥2012.6 (10.0–15.2)3.7 (1.9–5.5)7.0 (4.7–9.3)7.5 (5.2–9.8)20.1 (15.9–24.2)35.9 (29.9–41.9)
  • Data are % (95% CI). Diagnosed diabetes determined by self-report on interview. Values by age alone and by sex include those of race/ethnic groups not listed separately.

  • *

    * Estimates for the total population aged ≥12 and ≥20 years and for race/ethnic groups were age and sex standardized, estimates for age-specific groups including those aged ≥65 years were sex standardized, and estimates for sex groups were age standardized (all using the 2000 U.S. Census population).

  • FPG ≥7.0 mmol/l.

  • 2-h plasma glucose ≥11.1 mmol/l.

  • §

    § Estimates in this section have a denominator of total diabetes, whereas all other estimates have a denominator of the total population.

  • Relative SE >30%: the confidence interval is wide, relative to the size of the estimate.

  • Rounded to zero as method of calculating confidence intervals led to lower bounds that were slightly below zero.

  • #

    # Age group 12–19 years and age group ≥12 years standardized were excluded because few people aged 12–19 years had diabetes, resulting in unreliable estimates.

  • **

    ** There was no undiagnosed diabetes in women aged 20–39 years; therefore, the standardized estimate and associated confidence interval are unreliable.