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A longitudinal analysis of adherence and health status in childhood diabetes
S B Johnson1, M Kelly, J C Henretta
1University of Florida Health Science Center, Department of Psychiatry, Gainesville 32610-0234.
Insights
This study examined adherence to diabetes management in 193 children. While some adherence behaviors like Testing-Eating Frequency and Injection were linked to better metabolic control (HA1C, TRIG), the overall impact was small, with older children showing poorer adherence and control.
Area of Science:
- Pediatric Endocrinology
- Behavioral Medicine
- Metabolic Research
Background:
- Insulin-dependent diabetes mellitus (IDDM) management requires consistent adherence to complex regimens.
- Longitudinal studies are crucial for understanding the evolving relationship between adherence and metabolic control in pediatric populations.
- Assessing adherence through multiple constructs provides a comprehensive view of patient behavior.
Purpose of the Study:
- To investigate the relationship between specific adherence behaviors and metabolic control in children with IDDM.
- To explore the influence of patient age and disease duration on adherence and metabolic outcomes.
- To evaluate the effectiveness of structural equation modeling in analyzing longitudinal adherence data.
Main Methods:
- Longitudinal study design with 193 children diagnosed with IDDM, assessed twice over approximately 1.65 years.
- Quantification of six adherence constructs (Injection, Exercise, Diet Type, Testing-Eating Frequency, Calories Consumed, Concentrated Sweets) via 24-hour recall interviews.
- Structural equation modeling used to analyze relationships between adherence, glycemic control (HA1C), and lipid metabolism (TRIG), controlling for age and disease duration.
Main Results:
- Testing-Eating Frequency was significantly associated with better glycemic control (HA1C).
- Injection adherence was significantly associated with better lipid metabolism (TRIG).
- Patient age was a negative predictor for both adherence and metabolic control; older children exhibited poorer adherence and control. The overall predictive power of adherence on metabolic control was small.
Conclusions:
- Specific adherence behaviors demonstrate a modest link to improved metabolic control in pediatric diabetes management.
- Age is a critical factor influencing adherence and metabolic outcomes, with older children facing greater challenges.
- Further refinement of adherence measurement and modeling is needed to strengthen the understanding of these relationships in pediatric IDDM.
Abstract:
Applied structural equation modeling to a longitudinal data set of 193 youngsters with insulin-dependent diabetes mellitus assessed on two occasions, an average of 1.65 years apart. Six adherence constructs, Injection, Exercise, Diet Type, Testing-Eating Frequency, Calories Consumed, and Concentrated Sweets, were quantified from 24-hr recall interviews conducted with mother and child. Glycemic control was indexed by glycosylated hemoglobin (HA1C); lipid metabolism was indexed by fasting triglyceride levels (TRIG). The relationship of each adherence construct to metabolic control was tested separately. Patient age and disease duration served as exogenous variables in all models. Testing-Eating Frequency was associated with HA1C and Injection was associated with TRIG; in both cases better adherence was associated with better metabolic control. However, the standardized regression weights and variance accounted for were small. Patient age was a predictor of both adherence and metabolic control; older youngsters were less adherent and were in worse metabolic control. Inspection of models for younger versus older children suggested that age-homogeneous models improved prediction, but adherence and metabolic control linkages remained weak. Suggestions for refining the model are provided.