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Table 1 Incidence of type 1 diabetes mellitus and characteristics when first diagnosed by age category, 2001–2015

From: Fluctuations in the incidence of type 1 diabetes in the United States from 2001 to 2015: a longitudinal study

Age category, yearsa Incident cases Incidence rateb Ketoacidosis within 6 months of diagnosisc Emergency glucagon kit within 6 months of diagnosisd Rapid onsete
n   n % n % n %
< 5 1944 23.0 (22.0–24.1) 295 15.2% 1318 67.8% 1873 96.3%
5–9 2966 29.9 (28.9–31.0) 362 12.2% 2355 79.4% 2895 97.6%
10–14 4668 45.5 (44.2–46.8) 533 11.4% 3248 69.6% 4499 96.4%
15–19 3724 36.4 (35.3–37.6) 334 9.0% 1713 46.0% 3511 94.3%
20–24 1752 18.0 (17.2–18.9) 140 8.0% 344 19.6% 1608 91.8%
25–29 1841 16.6 (15.8–17.3) 126 6.8% 238 12.9% 1673 90.9%
30–34 1897 15.3 (14.6–16.0) 135 7.1% 201 10.6% 1693 89.2%
35–39 2042 15.9 (15.2–16.6) 164 8.0% 182 8.9% 1788 87.6%
40–44 2148 16.0 (15.3–16.7) 152 7.1% 139 6.5% 1843 85.8%
45–49 2353 17.8 (17.1–18.5) 134 5.7% 116 4.9% 2005 85.2%
50–54 2446 20.0 (19.2–20.8) 108 4.4% 117 4.8% 2063 84.3%
55–59 2424 23.4 (22.5–24.3) 83 3.4% 101 4.2% 2012 83.0%
60–64 2271 29.2 (28.0–30.4) 56 2.5% 66 2.9% 1864 82.1%
Total 32,476 22.9 (22.7–23.2) 2622 8.1% 10,138 31.2% 29,327 90.3%
  1. aAge at first diagnosis
  2. bIncident cases of type 1 diabetes per 100,000 person-years of healthcare coverage (95% confidence interval)
  3. cKetoacidsosis was recorded within 6 months (i.e., ±182 days) of the first diagnosis
  4. dEmergency glucagon kit was filled within 6 months (i.e., ±182 days) of the first diagnosis
  5. eFirst diagnosis of type 1 diabetes and the first insulin prescription filled were within 6 months (i.e., ±182 days)