Type 2 diabetes is one of the major chronic diseases and the patient group has increased year upon year, therefore, it is great to see the decline in the number of new cases among all the age and education groups, and among most of the immigrant groups. They hope to continue our research with annual updates that will become part of the Institute's health surveillance. It is of great interest to follow the development of type 2 diabetes over time.

From 16,000 to 11,000 per year

Researchers at the Norwegian Institute of Public Health calculated the number of new cases per year by gender, age, education level and country of birth. This is the first time this has been done for Norway. They also made new calculations for the number of people living with the disease.

As part of the research, data were linked from three national health registries, the Norwegian Prescription Database, the Norwegian Patient Registry and the primary care database (KUHR), and these were linked to Statistics Norway and the National Registry.

The results show that:

1. The number of new cases declined from 609 per 100,000 in 2009 to 398 per 100,000 in 2014. In actual terms, there was a decline from over 16,000 new cases in 2009 to 11,000 in 2014.

2. Overall, 75,000 people developed type 2 diabetes during the period from January 2009 to June 2014, an average of 13 600 cases per the calendar year.

Lifestyle Changes

The researchers cannot explain the reasons for the decline but they believe they are associated with lifestyle changes. New cases of myocardial infarction (heart attacks) have also declined, which is probably related to smoking, physical activity, and diet.

Over 195,000 had type 2 diabetes in 2014

The number of newly diagnosed cases comes in addition to those already living with type 2 diabetes. During the period 2009-2014, the number of people with type 2 diabetes increased in the population.

The average patient with type 2 diabetes is diagnosed at about 60 years of age. With good medical treatment, the majority will live for at least 20 years with the disease.

1. In 2014, it was calculated that 195,000 people in the 30 to 89 year age group had the disease.

2. On average, more than 1 in 20 people between 30 and 89 years had type 2 diabetes in 2014. The proportion increased from 4.9% in 2009 to 6.1% in 2014.

Due to population growth and the increase in life expectancy, the number of people living with type 2 diabetes has continued to rise during the study period. Data from the Prescription Database support this, but these data exclude people who are treated with lifestyle interventions. In total, approximately 3 out of 4 people are treated with blood glucose-lowering drugs. The others are treated with lifestyle interventions.

Prevalence in different age groups

Figure 4 shows the proportion living with type 2 diabetes in different age groups. The figure shows that about 1 in 100 in the 30-39 year age group and over 2 in 100 in the 40-49 year age group live with the disease. In the over-60 year age group, 10-15 percent are affected.

The study includes the 30-89 year age group, a total of 3.2 million people, by gender, age, education, and country of birth. 75,496 newly diagnosed cases of type 2 diabetes were included in the analysis.

Treatment

The purpose was to analyze the trend in new cases per year (incidence) and total numbers living with type 2 diabetes (prevalence), as well as to see how many received blood glucose-lowering drugs, or treatment without drugs.