Researchers created and validated a new 21-question scale measuring psychological factors that influence diet management in kidney dialysis patients. According to Gram Research analysis, the scale showed excellent reliability (Cronbach’s α of 0.964) and measures three key areas: patient attitudes toward diet rules, perceived social pressure, and confidence in making dietary changes. The scale was tested with 418 dialysis patients and could help doctors identify which patients need extra dietary support.
Researchers created and tested a new questionnaire to help kidney dialysis patients understand what influences their eating habits during treatment. The scale measures three key areas: how patients feel about diet rules, what family and friends think about their eating, and how confident they feel making healthy choices. According to Gram Research analysis, the new 21-question tool showed strong reliability and validity, meaning it accurately measures what it’s supposed to measure. This could help doctors better understand why some dialysis patients struggle with diet management and provide better support.
Key Statistics
A 2026 study of 418 hemodialysis patients found that a newly developed Diet Management Behavior Scale demonstrated excellent internal consistency with a Cronbach’s α of 0.964, indicating strong reliability for measuring psychological determinants of dietary adherence.
The 21-item scale explained 77.4% of cumulative variance in dietary management behavior across three psychological dimensions: attitude, subjective norms, and perceived behavioral control, according to exploratory factor analysis in the 2026 validation study.
Expert review of the Diet Management Behavior Scale by 19 kidney disease specialists achieved an authority coefficient of 0.88 and content validity index of 0.86, demonstrating strong expert agreement on the scale’s relevance to dialysis patients.
The scale showed split-half reliability of 0.914 but moderate test-retest reliability of 0.657, suggesting it is reliable for single-point assessment but may show variation if administered repeatedly over time to dialysis patients.
The Quick Take
- What they studied: Can researchers create a reliable questionnaire that measures the psychological factors affecting how well kidney dialysis patients follow dietary guidelines?
- Who participated: 418 kidney dialysis patients from four treatment centers in Suzhou, China, recruited between April and May 2024. The scale was also reviewed by 19 medical experts.
- Key finding: The new Diet Management Behavior Scale for Hemodialysis Patients contains 21 questions across three categories and showed strong reliability (Cronbach’s α of 0.964), meaning it consistently measures what it’s designed to measure.
- What it means for you: If you’re on dialysis, this tool could help your healthcare team better understand your eating challenges and provide more personalized support. However, the scale was only tested in one region of China, so results may need confirmation in other populations.
The Research Details
Researchers started by reviewing existing scientific literature and psychological theories about behavior change to create an initial list of questions. They then brought together 19 kidney disease experts who reviewed and refined these questions through two rounds of feedback (called the Delphi method). This expert panel had a 100% response rate, showing strong commitment to the project.
Next, the researchers gave the refined questionnaire to 418 dialysis patients at four treatment centers. They used statistical software to analyze how well the questions worked together, whether patients answered consistently, and whether the scale actually measured what it claimed to measure.
The final scale includes 21 questions organized into three main categories based on psychological theory: how patients feel about following diet rules (attitude), what they think family and friends expect (subjective norms), and how confident they feel making dietary changes (perceived behavioral control).
Dialysis patients must follow strict diets to stay healthy, but many struggle with compliance. Understanding the psychological reasons behind these struggles—not just the medical facts—is crucial. This scale provides doctors with a standardized tool to identify which patients need extra support and why they might be struggling.
The scale showed strong internal consistency (Cronbach’s α of 0.964 is excellent, with 0.7 or higher considered acceptable). The expert panel showed good agreement (authority coefficient of 0.88). However, test-retest reliability was moderate at 0.657, meaning answers might vary somewhat if patients took the test again. The scale explained 77.4% of the variation in responses, which is strong. The study was limited to one region in China, so results may not apply equally to all populations worldwide.
What the Results Show
The final Diet Management Behavior Scale contains 21 items organized into three dimensions. The overall reliability score (Cronbach’s α) was 0.964, which is considered excellent—this means the questions consistently measure the same underlying concept. Individual subscales ranged from 0.918 to 0.938, also excellent.
When researchers tested whether the scale measured the same thing when given twice (split-half reliability), they got a score of 0.914, indicating strong consistency. However, when the same patients took the test at different times (test-retest reliability), the score was 0.657, which is moderate. This suggests the scale is reliable for one-time use but may show some variation if used repeatedly over time.
The scale’s content validity index was 0.86, meaning experts agreed the questions actually measure what they’re supposed to measure. Individual question validity ranged from 0.800 to 1.000. Statistical analysis showed the three-factor structure explained 77.4% of the total variation in responses, which is considered very good.
The exploratory factor analysis confirmed that the three psychological dimensions (attitude, subjective norms, and perceived behavioral control) are the main factors influencing diet management in dialysis patients. The confirmatory factor analysis initially showed marginal fit, but after adjusting for measurement error, the model became acceptable. This suggests the theoretical framework is sound but may need minor refinement in future studies.
This is the first scale specifically designed to measure psychological determinants of diet management in dialysis patients during treatment sessions. Previous research has used general behavior change theories, but this scale adapts them specifically for the dialysis population. The strong reliability scores compare favorably to other validated health behavior scales in the literature.
The study only included patients from four dialysis centers in one Chinese city, so results may not apply equally to other regions or countries with different healthcare systems and cultural backgrounds. The moderate test-retest reliability (0.657) suggests the scale may not be ideal for tracking changes over multiple time points. The expert consensus, while good, was not exceptionally high (Kendall’s concordance of 0.245), suggesting some disagreement among experts. The study did not test whether the scale actually predicts real-world dietary behavior changes, only whether it measures psychological factors.
The Bottom Line
Healthcare providers can use this scale to assess the psychological barriers dialysis patients face with diet management (moderate to strong confidence). The tool appears reliable for one-time assessment but should be used alongside other clinical measures. Patients should not use this scale for self-diagnosis; it’s designed for healthcare professionals to use during clinical care.
Nephrologists and dialysis nurses should care about this tool—it helps them understand why patients struggle with diet rules. Dialysis patients may benefit indirectly if their doctors use this scale to provide better support. Researchers studying behavior change in chronic kidney disease should also find this useful. This scale is not appropriate for people without kidney disease or those not on dialysis.
If your healthcare team uses this scale to identify your specific diet challenges, you might see personalized support within weeks. However, changing eating habits typically takes 2-3 months to show real health benefits. The scale itself provides immediate insight but isn’t a treatment—it’s a diagnostic tool.
Frequently Asked Questions
What is the new dialysis diet scale and how does it work?
It’s a 21-question questionnaire measuring three psychological factors affecting diet choices: how patients feel about diet rules, what they think others expect, and their confidence in making changes. Doctors use it to understand why dialysis patients struggle with dietary compliance.
How reliable is this new scale for measuring diet behavior in dialysis patients?
The scale showed excellent reliability with a Cronbach’s α of 0.964 and split-half reliability of 0.914. However, test-retest reliability was moderate at 0.657, meaning it works best as a one-time assessment rather than repeated measurements.
Can dialysis patients use this scale to check their own diet management?
This scale is designed for healthcare professionals to use during clinical care, not for patient self-assessment. Your dialysis team can use it to identify your specific challenges and provide personalized support for following your diet.
Will this scale work for dialysis patients outside of China?
The scale was only tested in one Chinese city with 418 patients, so results may not apply equally to other regions or countries. Further validation in diverse populations is needed before widespread international use.
How quickly will using this scale improve my diet management?
The scale itself doesn’t improve diet—it identifies your barriers. Once your healthcare team understands your challenges, personalized support may help within weeks, but actual dietary habit changes typically take 2-3 months to show health benefits.
Want to Apply This Research?
- Track your confidence level (1-10 scale) in following your dialysis diet each week. Note specific barriers you face, such as ‘family doesn’t support my diet’ or ‘I don’t feel confident saying no to salty foods.’ Compare these weekly to see if barriers change.
- Use the app to log which psychological factor most affects your diet on any given day: Is it your attitude toward the diet, social pressure from others, or lack of confidence? Once you identify your biggest challenge, set one small goal to address it that week.
- Monthly, review your app data to see which psychological barriers appear most often. Share this pattern with your dialysis team so they can provide targeted support. Track whether addressing one barrier (like building confidence through education) improves your overall diet adherence.
This scale is a research tool designed for use by healthcare professionals only and should not be used for self-diagnosis or self-treatment. If you are a dialysis patient, discuss any dietary concerns with your nephrologist or dialysis care team. This study was conducted in China and has not yet been validated in all populations worldwide. The findings represent preliminary evidence and should be confirmed with additional research before widespread clinical implementation. Always follow your healthcare provider’s specific dietary recommendations for your individual condition.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.