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The Brussels Infant and Toddler Stool Scale: A Study on Interobserver Reliability
Koen Huysentruyt1, Ilan Koppen2, Marc Benninga2
1KidZ Health Castle, UZ Brussel, Vrije Universiteit Brussel, Brussels, Belgium.
Insights
The Brussels Infant and Toddler Stool Scale (BITSS) reliably assesses stool consistency in young children. This scale offers good agreement with the Bristol Stool Form Scale (BSFS) for infants and toddlers.
Area of Science:
- Pediatrics
- Gastroenterology
- Clinical Assessment
Background:
- The Bristol Stool Form Scale (BSFS) is not suitable for assessing stool consistency in non-toilet trained children.
- The Brussels Infant and Toddler Stool Scale (BITSS) was developed using photographs of infant and toddler stools in diapers.
Purpose of the Study:
- To evaluate the interobserver reliability of stool consistency assessment using the BITSS among parents, nurses, and medical doctors (MDs).
Main Methods:
- A multicenter cross-sectional study involving 2462 observers (parents, nurses, MDs) from 2016-2017.
- Observers rated BITSS photographs based on the BSFS criteria.
- Reliability was assessed using the proportion of perfect agreement and linearly weighted kappa (κ) statistic.
Main Results:
- The BITSS photographs corresponding to BSFS types 7 and 4 showed the highest agreement (87.5% and 87.6%).
- Overall weighted kappa (κ) was 0.72, indicating good agreement.
- A new categorization system (hard, formed, loose, watery stools) demonstrated correct allocation ranging from 83% to 96%.
Conclusions:
- The BITSS demonstrates good agreement with the BSFS.
- The BITSS, with its newly categorized photographs, is a reliable tool for assessing stool consistency in non-toilet trained children in clinical practice and research.
- A multilanguage version of the BITSS is available for download.
Objectives:
The Bristol Stool Form Scale (BSFS) is inadequate for non-toilet trained children. The Brussels Infant and Toddler Stool Scale (BITSS) was developed, consisting of 7 photographs of diapers containing stools of infants and toddlers. We aimed to evaluate interobserver reliability of stool consistency assessment among parents, nurses, and medical doctors (MDs) using the BITSS.
Methods:
In this multicenter cross-sectional study (2016-2017), BITSS photographs were rated according to the BSFS. The reliability of the BITSS was evaluated using the overall proportion of perfect agreement and the linearly weighted κ statistic.
Results:
A total of 2462 observers participated: 1181 parents (48.0%), 624 nurses (25.3%), and 657 MDs (26.7%). The best-performing BITSS photographs corresponded with BSFS type 7 (87.5%) and type 4 (87.6%), followed by the BITSS photographs representing BSFS type 6 (75.0%), BSFS type 5 (68.0%), BSFS type 1 (64.8%), and BSFS type 3 (64.6%). The weakest performing BITSS photograph corresponded with BSFS type 2 (49.7%). The overall weighted κ-value was 0.72 (95% CI 0.59-0.85; good agreement). Based on these results, photographs were categorized per stool group as hard (BSFS type 1-3), formed (BSFS type 4), loose (BSFS types 5 and 6), or watery (BSFS type 7) stools. According to this new categorization system, correct allocation for each photograph ranged from 83 to 96% (average: 90%). The overall proportion of correct allocations was 72.8%.
Conclusions:
BITSS showed good agreement with BSFS. Using the newly categorized BITSS photographs, the BITSS is reliable for the assessment of stools of non-toilet trained children in clinical practice and research. A multilanguage translated version of the BITSS can be downloaded at https://bitss-stoolscale.com/.
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