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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)