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. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: Am J Prev Med. 2015 Jan 15;48(3):253–263. doi: 10.1016/j.amepre.2014.10.004

Table 2.

Crude Prevalence of Glycemic Status for Older-adult Americans, by Age and Survey Period, 1999–2010

Glycemic or prediabetes status by age group Men Women
Prevalence (95% CI) by survey period Absolute prevalence change Prevalence (95% CI) by survey period Absolute prevalence change
1999–2004 2005–2010 1999–2004 2005–2010
Glycemic status (50–64 years)
 Normal 35.8 (31.6, 40.2) 29.6 (25.3, 34.3) −6.2 54.5 (50.1, 58.9) 44.5 (40.8, 48.3) −10.0***
 Diagnosed diabetes 11.9 (10.4, 13.6) 12.8 (11.0, 14.8) 0.9 10.2 (8.6, 12.0) 12.1 (9.8, 14.8) 1.9
 Undiagnosed diabetes 5.7 (3.9, 8.3) 6.4 (4.5, 9.0) 0.7 4.0 (2.6, 6.0) 2.5 (1.5, 4.1) −1.5
 Prediabetesa 46.6 (41.8, 51.4) 51.2 (46.3, 56.1) 4.6 31.3 (27.9, 35.1) 41.0 (36.5, 45.6) 9.7**
 Total 100.0 100.0 100.0 100.0
Glycemic status (65–74 years)
 Normal 26.4 (21.9, 31.3) 22.1 (18.0, 26.8) −4.3 38.2 (31.7, 45.2) 25.8 (20.7, 31.7) −12.4**
 Diagnosed diabetes 19.6 (16.8, 22.7) 20.9 (17.5, 24.8) 1.3 17.2 (14.4, 20.5) 19.3 (16.2, 22.8) 2.1
 Undiagnosed diabetes 10.1 (7.6, 13.4) 9.7 (6.4, 14.4) −0.4 5.6 (3.3, 9.3) 6.5 (3.9, 10.6) 0.9
 Prediabetes 43.9 (38.1, 49.8) 47.3 (42.2, 52.4) 3.4 38.9 (33.7, 44.4) 48.4 (42.8, 54.0) 9.5**
 Total 100.0 100.0 100.0 100.0
Glycemic status (≥75 years)
 Normal 29.2 (24.3, 34.6) 21.9 (17.4, 27.1) −7.3* 36.4 (30.6, 42.7) 26.8 (22.9, 31.2) −9.6*
 Diagnosed diabetes 13.9 (11.4, 16.8) 17.5 (13.9, 21.7) 3.6 16.8 (13.5, 20.7) 17.5 (15.3, 20.0) 0.7
 Undiagnosed diabetes 7.8 (5.2, 11.4) 10.4 (7.7, 13.9) 2.6 4.3 (2.8, 6.5) 7.6 (5.4, 10.6) 3.3
 Prediabetes 49.2 (43.5, 55.0) 50.2 (45.2, 55.2) 1.0 42.5 (36.8, 48.3) 48.0 (43.5, 52.5) 5.5
 Total 100.0 100.0 100.0 100.0
HbA1c5.7 by age
 50–64 years 14.5 (11.6, 17.9) 25.0 (21.2, 29.2) 10.5*** 16.5 (13.9, 19.3) 27.1 (23.7, 30.9) 10.6***
 65–74 years 17.4 (13.3, 22.5) 27.4 (21.9, 33.8) 10.0* 23.2 (19.1, 27.8) 33.4 (26.8, 40.7) 10.2*
 ≥75 years 24.1 (20.2, 28.5) 29.2 (24.4, 34.4) 5.1 21.3 (16.7, 26.6) 35.7 (31.5, 40.1) 14.4***
IFG by age
 50–64 years 40.9 (36.4, 45.5) 43.4 (39.2, 47.8) 2.5 25.8 (22.0, 30.0) 28.8 (24.6, 33.5) 3.0
 65–74 years 37.5 (32.1, 43.2) 38.2 (33.3, 43.4) 0.7 31.6 (26.5, 37.2) 31.0 (26.0, 36.5) −0.6
 ≥75 years 45.2 (38.9, 51.7) 42.9 (38.0, 48.0) −2.3 35.8 (30.5, 41.4) 31.8 (26.6, 37.4) −4.0

Note: p-values were calculated from a t-test. Boldface indicates statistical significance (*p<0.05; **p<0.01; ***p<0.001).

a

Prediabetes is defined by HbA1c5.7 and/or IFG.

HbA1c5.7, hemoglobin A1c=5.7%–6.4% (39–47 mmol/mol); IFG, impaired fasting glucose (fasting plasma glucose=100–125 mg/dL).