Original article

Metabolic control of type 1 diabetic patients followed at the University Children’s Hospital in Bern: Have we reached the goal?

DOI: https://doi.org/10.4414/smw.2010.13057
Publication Date: 05.07.2010
Swiss Med Wkly. 2010;140:w13057

P Tonella, C Flück, P Mullis

Please find the affiliations for this article in the PDF.


Question under study: In type 1 diabetes (T1DM), a good metabolic control is important to reduce and/or postpone complications. Guidelines regarding how to achieve this goal are published by the American Diabetes Association (ADA) and the International Society of Paediatric and Adolescence Diabetes (ISPAD). The aims of this study were to determine the current level of metabolic control in T1DM patients on different treatment regimens, followed at the diabetes outpatient unit of the University Children’s Hospital Bern, Switzerland, and to compare it with both the reported data from ten years ago (1998) and with the current guidelines of the ADA and ISPAD.

Methods: This was an observational, cross-sectional study and involved assessment of HbA1c levels as a surrogate marker of the metabolic control in all patients seen during a regular four month interval at our outpatient clinic.

Results: A total of 152 patients (88m, 64f) were recorded. 43.4% (n = 66) were conventionally treated (insulin: twice-daily, three-dose treatment), whereas 56.6% (n = 86) were on a multiple injection treatment (e.g. functional insulin treatment and/or insulin pump). Actual overall HbA1c values, expressed as medians (25th/75thcentiles), were 7.6% (7.0/8.3) compared to 7.9% (7.3/8.6) in 1998 (p <0.01). In younger, prepubertal children the HbA1c value recorded was 7.4% (6.9/8.1), and 7.7% (7.2/8.5) in adolescents. Interestingly, no significant difference was observed between HbA1c levels of conventionally versus intensively treated patients.

Conclusions: With current treatment strategies, glycaemic control of T1DM children and adolescents improved significantly (p <0.01) between 1998 and 2008, although only a minority of the subjects reached the ISPAD goals.


Taking care of chronically ill patients, in particular with type 1 diabetes mellitus (T1DM), is a major challenge in paediatrics. This is of great importance as 50% of subjects with T1DM are diagnosed within the first 15 years of life and three quarters of all cases are found in individuals younger than 18 years of age [1]. Furthermore, it has recently been assumed that between 2005 and 2020 the prevalence of T1DM in children younger than 15 years will rise by 70% [2]. In Switzerland, the only and last nationwide survey of the 0–14 year age group revealed an incidence rate of 10.5 per 100’000, with a large annual increase in incidence of 23.8% in children younger than 4 years between 1991 and 1999 [3]. In general, to prevent long-term complications, such as retinopathy, nephropathy as well as neuropathy for example, the best possible metabolic control in both children and adults with T1DM is crucial. Underlining these facts, the Diabetes Control and Complications Trial (DCCT) in 1993 followed by the Epidemiology of Diabetes Interventions and Complications (EDIC) study in 2003 unambiguously showed that improving glycaemic control in a population of 13–39 year old T1DM subjects reduced the risk for microvascular complications [4, 5]. In addition, it has been reported that a memory effect of an improved metabolic control continues over the years [6], and that intensified therapy resulting in better metabolic control also reduces macrovascular complications [7]. This correlates with the recently reported decrease of overall diabetes-related excess mortality in Switzerland over the last two decades [8]. Also in the paediatric age group, it has been shown that good glycaemic control is the most crucial factor for prevention of long-term microvascular complications. [9]. This can be achieved by daily self-monitoring of blood glucose (SMBG) and by regular measurements of glycated haemoglobin (HbA1c), which has a strong predictive value for diabetic complications [10]. According to the guidelines of the American Diabetes Association (ADA), treatment of T1DM should target a HbA1c of below or around 7% in adults, between 7.5% and 8.5% in pre-schoolers, below or around 8% in school aged children and below or around 7.5% in adolescents and young adults [11, 12]. In contrast, the more stringent guidelines of the International Society for Paediatric and Adolescent Diabetes (ISPAD) recommend a target HbA1c level of less than 7.5%, if achieved without severe episodes of hypoglycaemia [13].

Therefore, the aims of this study were a) to assess the quality of care of T1DM subjects followed at the diabetes outpatient clinic at the University Children’s Hospital, Bern, and to compare it with our data obtained ten years ago [14], and b) to compare our data with those of international studies and guidelines of the ADA and ISPAD.

Patients and methods


Subjects with T1DM seen during a four month period at the outpatient clinic of the University Children’s Hospital Bern, Switzerland (October 1st, 2007 to January 31st, 2008) were enrolled in an observational, cross-sectional study. Clinical and demographic data, such as insulin regimen, HbA1c, gender, age at diagnosis, diabetes duration, Body Mass Index (BMI; standard deviation score: SDS [15]), pubertal status according to Tanner staging [16] and daily insulin need (expressed as IU/kg body weight/day), were assessed once during the study period. Patients were considered pubertal from Tanner stage 2 onwards [16].

Study setting

Following a descriptive analysis and after testing the two study populations (1998 vs. 2008) for differences (insulin need, age at diagnosis, diabetes duration, BMI), we compared actual mean HbA1c values obtained with our previously reported data [14] as well as published studies from other centres [17–19], in order to challenge our own treatment strategies.

Concerning diabetes duration, we distinguished between a “honeymoon-group” (diabetes duration of <2 years and/or <0.5 IU insulin / kg) and a group with no residual activity (>2 years duration, C-peptide negative) [20, 21]. The conventional regimen consisted of twice-daily or three-dose insulin injections daily, whereas intensified treatment was defined as either functional insulin treatment (FIT) or continuous subcutaneous insulin injection (CSII). Furthermore, the conventional regimen involves the administration of two or three injections of insulin, mainly a combination of regular short-acting and intermediate-acting insulin (usually before breakfast and dinner, and at bed-time, respectively), coupled with self-monitoring of blood glucose (SMBG) and adjustments of insulin dosage in response to the individual’s glycaemic control. Importantly, hyperglycaemia (>12 mmol/L) was corrected with rapid-acting insulin (for details see: http://www.kinderkliniken.insel.ch/scripte-endo01.html). In FIT treated subjects, however, insulin is applied in a more physiological way partly mimicking the insulin production of the healthy pancreas. This treatment implies taking rapid-acting insulin before each meal and four adjustment injections (bolus) and two long-acting insulin doses to cover the need for insulin between meals and during the night (basis). (http://www.kinderkliniken.insel.ch/scripte-endo01.html)

Severe hypoglycaemia

As there are different types of hypoglycaemia, of which mild and moderate types are often seen particularly in those with a very good metabolic control we asked for and registered the severe hypoglycaemic episodes only. In these episodes, regarded as blood glucose <3.5 mmol/L with loss of consciousness or seizure, severe symptoms of hypoglycaemia disable the child temporarily, requiring the assistance of another person to give something to eat or a glucagon injection.


HbA1c was determined by the Latex-Immunagglutination method (DCA 2000 Analyzer, Bayer Corporation, Elkart, IN 46514 USA). The same Analyzer was used for HbA1c assessment in 1998 and 2007/2008. For this NGSP-certified assay, normative HbA1c values for healthy, non-diabetic individuals range between 4.0% and 5.6%. It allows an accurate measurement for values up to 14%, while higher values are recorded as >14%. Therefore, in order to allow numeric analysis of the data, all values >14% entered the analysis as 14%. This study was approved by the local ethical committee, and oral consent was obtained by either patients and/or parents.

Statistics and data analysis

All data are expressed as medians (25th/ 75thcentiles). Due to a lack of normal distribution of our data, statistical analysis was performed applying the Mann-Whitney U-Test using SPSS (Superior Performing Software System; SPSS Inc. Headquarters, 233 S. Wacker Drive, Chicago, Illinois 60606. USA). p <0.05 was considered as statistically significant. Furthermore, despite the small data sets, a multiple linear regression analysis includinginsulin need, BMI (in SDS), age, gender, pubertal stage (Tanner) and duration of diabetes was performed (SPSS).


A total of 152 diabetic patients (88 males, 64 females) entered the study. Their characteristics are described in table 1. To summarise: one third of the patients had diabetes for more than 2 years, and were C-peptide negative; additionally, more than 60% were pubertal, and 66 patients (43.4%) were on a conventional regimen whereas 68 (44.7%) and 18 (11.9%) were treated with FIT and CSII, respectively. Overall median HbA1c was 7.6% (25th/75thcentiles: 7.0/8.3); in more detail, male and female patients presented with a median HbA1c level of 7.6% (6.9/8.3) and 7.7% (7.1/8.5), respectively. It is important to stress that metabolic control in our cohort was not different between the insulin regimen groups. Median HbA1c was 7.5% (6.9/8.3) in patients treated conventionally, whereas in those treated with an intensive regimen median HbA1c was 7.6% (7.1/8.4). Interestingly, while the prevalence of childhood obesity and being overweight in Switzerland is reported to be 15–20%, only one patient (0.65%) presented with a BMI above +2 SDS, and only 5 individuals (3.28%) presented with a BMI > +1.5 SDS highlighting the positive effect of a tight control by a clinical dietician [22].


Figure 1

Age related use of different insulin treatment regimens in children and adolescents.


Figure 2

Treatment modalities 1998–2008.

Focusing on the diabetes control, the ADA goals were reached by 56/70 pre-school children (80%), 38/61 of the subjects aged 6 to 12 years (62.3%) and 11/21 of the patients aged 12 to 19 years (52%). However, the more stringent ISPAD goals were only reached by 40/152 subjects (26.3%).

Multiple regression analysis showed that the only variable significantly related to HbA1c was the duration of diabetes (p <0.001), while the other parameters did not show a correlation (data not shown). During the data collection period, only one case of severe hypoglycaemia with unconsciousness and seizures was observed, and this occurred in a patient treated with FIT. In addition, we performed age-related analysis for treatment modalities used in the studied subjects. This analysis revealed a clear prevalence of conventional insulin regimen used during the first 6 years of life (89.5%). This partly explains why the diabetes duration was significantly shorter in conventionally treated subjects compared to the intensive group (1.8 versus 5 years, expressed as median, data not shown). Thereafter, in children older than 6 years, a gradual increase (e.g. 28.5%) in the use of FIT or CSII occurred at the age of 6-7 years, and an 80% increase at the age of 14–15 years was noticed. However, very few toddlers were treated by CSII, while some adolescents did not want to change the treatment and were still managed conventionally (fig. 1).

Comparison of the current data with the data obtained in the 1998 evaluation

Our current analysis was compared with the evaluation performed in 1998 [14]. The statistical analysis revealed no significant difference in insulin need, age at enrolment, BMI and diabetes duration between the two study populations (table 2). It is of importance to highlight that the insulin used did not differ at all; the subjects on an intensive insulin regimen in 1998 were already treated with the same insulin analogues. The quality of care evaluation for T1DM at the same outpatient clinic in 1998 revealed a median HbA1c of 7.9% (7.3/8.9). Thus, during the 10 years, metabolic control has significantly (p <0.02) improved (median HbA1c of 7.6%) (table 2). While HbA1c levels were markedly lower in T1DM individuals treated with the 3 injection-regimen in 2008 (p <0.01; HbA1c 1998 vs. 2008), no difference was found for individuals treated with the twice-daily insulin and FIT regimen (p <0.4 and p <0.1, respectively). In addition, over the last decade, treatment of T1DM in children and adolescents revealed a marked shift towards intensified treatment modalities (9.6% vs. 56.5% in 2008, fig. 2).

Table 1Clinical data, grouped by the pubertal stage, gender, diabetes duration, Body Mass Index and treatment modality, expressed as median (25th/75th).
Pubertal stage(Tanner)157 (37.5)7.4 (6.9/8.1)
≥295 (62.5)7.7 (7.2/8.5)
Gendermale88 (57.9)7.6 (6.9/8.3)
female64 (42.1)7.7 (7.1/8.5)
Duration<2 years105 (69.0)7.6 (6.9/8.2)
>2 years47 (31.0)7.7 (7.0/8.6)
BMI<1 SDS130 (85.5)7.6 (7.0/8.3)
>1 SDS22 (14.5)7.8 (7.0/8.4)
Treatmentconventional66 (43.4)7.5 (6.9/8.3)
intensive86 (56.6)7.6 (7.1/8.4)
Table 2Comparative statistics between the 1998 and 2008 study population.
HbA1c (%, Norm: 4.3–5.6%)7.9 (7.3/8.9)115 (100)7.6 (7.0/8.3)152 (100)< 0.02
Conventional regimen2 injections7.80 (7.1/8.5)62 (53.9)7.7 (7.0/8.3)28 (18.4)<0.4
3 injections8.2 (7.6/8.8)42 (36.5)7.5 (6.9/8.3)38 (25)<0.01
Intensive regimenFIT7.9 (7.6/8.6)11 (9.6)7.6 (7.2/8.5)68 (44.7)<0.1
CSII  7.5 (6.8/8.2)18 (11.9) 
Age at diagnosis (years)6.8 (3.4/11.4) 6.9 (3.2/10.6) < 0.6
Diabetes duration (years)3.2 (1.6/6.0) 3.4 (1.3/6.5) < 0.8
Insulin dose (IU/kg/day)0.9 (0.7/1.0) 0.9 (0.7/1.1) < 0.6
BMI (SDS) 0.3 (-0.4/+0.8) 0.2 (-0.4/+0.7) < 0.3


This cross-sectional study shows a significantly improved metabolic control in 152 type 1 diabetics, at the childrens’ and adolescents’ diabetes centre of the University children’s hospital Bern, over the last 10 years. This effect was noted without obvious changes in the characteristics of the population of patients, personnel or methodology of measuring HbA1c. Expressed as mean ± 1SDS, the current HbA1c was 7.8 ± 1.4% compared to 8.0 ± 1.2% in 1998. The most significant difference between 1998 and 2008, as far as the glycaemic control is concerned, was observed in the subgroup treated with 3 insulin injections daily. This might be due to the fact that in the last 10 years, our policy has been towards introducing intensive insulin regimens earlier, partly in order to increase flexibility and reduce diet-related treatment and compliance burdens. The introduction of corrections with insulin analogues, even in conventionally treated subjects, could also partly explain this improvement. Furthermore, the significantly (p <0.001) shorter duration of diabetes in the subgroup on conventional insulin therapy may play an important role (1.8 years vs. 5 years: conventional vs. intensive), as the multiple regression analysis showed that the only factor having a positive impact on a better metabolic control was the duration of diabetes (p <0.001), but not age, insulin regimen or pubertal stage. In our cohort, age-related treatment modalities revealed that the conventional, less invasive treatment was predominantly used in young age, whereas after 6 years of age the number of children using FIT increased constantly.

In terms of weight, underlining the impact of a tight diet control, the occurrence of being overweight or obesity was much lower than in non-diabetic Swiss children.

Furthermore, it is of importance to compare our treatment results not only over the years but also with other international studies and treatment guidelines. For instance, the Hvidøre study group reported, in 1995 and 1998, substantial differences in metabolic control between several paediatric diabetes centres around the world [17, 18]. Additionally, after a decade, no significant improvement in glycaemic control was observed, with mean HbA1c values ranging from 7.4 to 9.2% regardless of the insulin regimen. Overall, in these studies 64% of the female and 56% of the male subjects were on an intensive insulin treatment [19], which was similar to our cohort (2008: 56.3% intensive). Compared to these study centres, we observed a mean HbA1c (±SD) of 7.8 (±1.4), which is significantly (p <0.01) lower than the mean HbA1c of the Hvidøre study (8.2 ± 1.4).

In addition, comparing mean HbA1c levels obtained in the different age groups, pre-school children (7.6 ± 0.7%) and school aged subjects (7.6 ± 1.2%) reached the ADA targets for HbA1c, while the adolescents did not (8.1 ± 1.7%) [11, 12]. In absolute numbers, the subjects reaching the international goals were only between 26.3% (ISPAD) and 52–80% (ADA). However, it is proven that a good metabolic control in patients with T1DM reduces the incidence of complications and delays the progression of existing complications [5]. This, obviously, also holds true for the paediatric population [6]. Therefore, to mimic physiology, intensified insulin replacement modalities (FIT, CSII) may be considered already at an earlier age. On the other hand, the descriptive analysis of our patients treated conventionally or intensively in 2008 showed a similar metabolic control. This may indicate that the insulin regimen may not be the only factor influencing the metabolic control. Adherence to a proposed treatment has been shown to be weaker for intensive regimens, suggesting a mismatch between what clinicians propose and the degree to which patients and their families can manage diabetes [27].

The only severe hypoglycaemic episode was observed in the intensive treatment group. As we did not assess the incidence of mild to moderate hypoglycaemia, commonly occurring in subjects with T1DM on a tight metabolic control, this finding, when it comes to the analysis of hypoglycaemia, should be taken with caution. However it has been shown that an intensive insulin treatment may result in a more stable glycaemic control and cause less mild to moderate and nocturnal hypoglycaemia when compared with conventional regimens [28, 29].

Finally, it is important to individualise the decision of treatment modality for every situation, and a conventional insulin regimen consisting of 2 or 3 insulin injections daily may still be the best and most appropriate therapy for a young child. The choice has to be made together with the patient and his/her parents upon consideration of several factors such as age of the subject, acceptance of restricted versus flexible diet and fixed versus flexible but multiple insulin injections, the cultural/intellectual background of the subject and the family, compliance, and obviously the presence of a partial remission phase.

In conclusion with the current strategy to treat the children and adolescents suffering from T1DM, we almost reached all the guideline-recommended HbA1c targets and are not second to international diabetes centres. Importantly, our patients show a much lower prevalence of being overweight and obesity compared to their non-diabetic peers. Therefore, in our opinion, we have achieved further improvement of the metabolic control in T1DM children and adolescents in the last 10 years through a multidisciplinary approach of care (nurse specialists, psychologists, dieticians, diabetologists) and by the flexible use of all available treatment options on an individual, child friendly base. Nevertheless, there is still a lot to improve to help children to cope with their ever-lasting disease.

Funding / potential competing interests

No external funding. No competing interests.


Prof. Primus-E. Mullis

Paediatric Endocrinology, Diabetology & Metabolism
University Children’s Hospital
CH-3010 Bern
E-Mail: primus.mullis@insel.ch


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