Table 2. Distribution of Glucose Metabolism Abnormalities in US Adolescents and Young Adults by Agea.
| Characteristic | % (95% CI) | |
|---|---|---|
| Adolescents | Young Adults | |
| Age, y | 12-18 | 19-34 |
| Normal glucose | 82.0 (79.9-84.0) | 76.0 (73.9-78.1) |
| IFG only | 9.2 (7.8-10.7) | 11.4 (9.7-13.4) |
| IGT only | 2.8 (2.0-3.8) | 3.2 (2.6-4.0) |
| Increased HbA1c level only | 3.7 (3.0-4.7) | 4.6 (3.9-5.4) |
| IFG + IGT | 0.7 (0.3-1.6) | 1.3 (0.9-1.9) |
| IFG + increased HbA1c level | 1.0 (0.7-1.6) | 2.2 (1.7-2.8) |
| IGT + increased HbA1c level | 0.3 (0.2-0.5) | 0.3 (0.2-0.6) |
| IFG + IGT + increased HbA1c level | 0.2 (0.1-0.5) | 0.9 (0.5-1.4) |
| All IFG | 11.1 (9.5-13.0) | 15.8 (14.0-17.9) |
| All IGT | 4.0 (3.1-5.2) | 5.8 (4.9-6.8) |
| All increased HbA1c level | 5.3 (4.3-6.4) | 8.0 (7.0-9.2) |
| Any prediabetes | 18.0 (16.0-20.1) | 24.0 (21.9-26.1) |
Abbreviations: HbA1c, glycated hemoglobin A1c; IFG, impaired fasting glucose; IGT, impaired glucose tolerance.
a
Impaired fasting glucose is defined as a blood glucose level of 100 mg/dL to less than 126 mg/dL (to convert to mmol/L, multiply by 0.0555). Impaired glucose tolerance is defined as 2-hour plasma glucose level of 140 mg/dL to less than 200 mg/dL after oral glucose tolerance test. Increased HbA1c level defined as 5.7% to less than 6.5% (to convert to proportion of total hemoglobin, multiply by 0.01). Prediabetes is defined as having any of IFG, IGT, or increased HbA1c level.