Type 1 diabetes in Connecticut
T1D Index estimates for 2025 · United States
An estimated 17,608 people are living with type 1 diabetes in Connecticut in 2025. Each year about 561 people are newly diagnosed and 139 people with T1D die. A further 3,981 people would be alive today had they not died early from type 1 diabetes.
People living with T1D
17,608
New diagnoses in 2025
561
Deaths in 2025
139
Missing people
3,981
Expected age at death, 10-year-old with T1D
69.9years
How many people have type 1 diabetes in Connecticut?
17,608 people in Connecticut are living with type 1 diabetes in 2025, or 470.7 per 100,000 people. That is close to the United States average of 435.7 per 100,000 and higher than the global average of 115.5. Connecticut has the 28th-largest number of people living with T1D of the 50 states and the District of Columbia.
For every 100 people living with T1D in Connecticut, another 23 are missing: people who would be alive today had they not died early from T1D.
How many children and young people have type 1 diabetes in Connecticut?
2,077 people younger than 20 were living with type 1 diabetes in Connecticut in 2024 (95% CI, 2,020–2,135), out of 17,197 people of all ages. About 24.2 in every 100,000 people younger than 20 were newly diagnosed that year, close to the national rate of 24.0. These 2024 figures and their confidence intervals are published in JAMA Network Open.
| 2024 | Connecticut | 95% CI | United States |
|---|---|---|---|
| People living with T1D, all ages | 17,197 | 16,652–17,779 | 1,476,859 |
| People living with T1D, younger than 20 | 2,077 | 2,020–2,135 | 196,778 |
| New diagnoses per 100,000 people younger than 20 | 24.2 | 21.8–26.8 | 24.0 |
| Pediatric endocrinologists per 1,000 people younger than 18 with T1D | 18.9 | 18.4–19.5 | 10.1 |
Cite as: Wang F, Haynes A, Dabelea D, et al. Type 1 diabetes incidence and prevalence in the US. JAMA Netw Open. 2026;9(8):e2627732. doi:10.1001/jamanetworkopen.2026.27732. Download the table for every state (CSV).
Is type 1 diabetes increasing in Connecticut?
The number of people living with T1D in Connecticut went from 9,475 in 2000 to 17,608 in 2025, and is projected to rise to 23,362 by 2040 (+33%).
| Year | Living with T1D | New diagnoses | Deaths | Missing people |
|---|---|---|---|---|
| 2000 | 9,475 | 413 | 156 | 3,267 |
| 2010 | 12,644 | 483 | 121 | 3,568 |
| 2020 | 15,771 | 532 | 186 | 3,748 |
| 2025 | 17,608 | 561 | 139 | 3,981 |
| 2030 (projected) | 19,657 | 646 | 193 | 4,251 |
| 2040 (projected) | 23,362 | 653 | 223 | 4,991 |
What is the life expectancy with type 1 diabetes in Connecticut?
A 10-year-old diagnosed with type 1 diabetes in Connecticut in 2025 is expected to live to 69.9, compared with 82.0 for a 10-year-old without T1D: 12.1 years of life lost. Counting years lived with complications as well, T1D costs 22.0 years of healthy life at today's level of care. If everyone received timely diagnosis, insulin and test strips, and insulin pumps and CGMs, that loss would fall to 15.1 years.
| Level of care | Healthy years restored | Healthy years of life | Healthy years still lost |
|---|---|---|---|
| Current level of care | – | 59.9 | 22.0 |
| + Timely diagnosis for everyone | – | 59.9 | 22.1 |
| + Insulin and test strips for everyone | +1.2 | 61.1 | 20.9 |
| + Insulin pumps and CGMs for everyone | +5.8 | 66.9 | 15.1 |
How does Connecticut compare?
| 2025 | Connecticut | United States | World |
|---|---|---|---|
| People living with T1D per 100,000 | 470.7 | 435.7 | 115.5 |
| New diagnoses per 100,000 | 15.0 | 15.1 | 6.2 |
| Missing people per 100 living with T1D | 22.6 | 25.1 | 43.0 |
| Expected age at death, 10-year-old with T1D | 69.9 | 67.0 | 51.3 |
| Expected age at death, 10-year-old in the general population | 82.0 | 80.1 | 77.0 |
Type 1 diabetes in other US states
More data
All figures are T1D Index version 3.0 estimates for all ages. Missing people are those who would be alive today had they not died early from type 1 diabetes. Expected age at death is for a 10-year-old. See Data & Methods for how the estimates are made and the peer-reviewed publications behind them.