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Performance of a predictive model for streptococcal pharyngitis in children
M W Attia1, T Zaoutis, J D Klein
1Department of Pediatrics, Alfred I. Dupont Hospital for Children, Wilmington, Deleware, USA.
Insights
A predictive model for Group A beta-hemolytic streptococcus (GABHS) pharyngitis in children accurately identified infections. This tool aids diagnosis when testing is unavailable, outperforming clinical judgment.
Area of Science:
- Pediatric infectious diseases
- Clinical diagnostics
- Epidemiology
Background:
- Group A beta-hemolytic streptococcus (GABHS) pharyngitis is a common childhood illness with challenging clinical diagnosis.
- Current diagnostic methods often lead to overdiagnosis and overtreatment.
- Existing predictive models for GABHS pharyngitis in children lack prospective validation.
Purpose of the Study:
- To prospectively evaluate a previously developed predictive model for GABHS pharyngitis in children.
- To assess the model's performance across diverse clinical settings and seasons.
- To compare the model's accuracy against clinical judgment and rapid diagnostic tests.
Main Methods:
- Prospective cohort study involving children aged 1-18 years with pharyngitis.
- Data collection included standardized recording of clinical features and throat culture for GABHS.
- Analysis focused on posttest probabilities associated with the model's positive and negative predictors.
Main Results:
- Out of 587 analyzed patients, 37% tested positive for GABHS.
- The model's positive predictors yielded a 79% posttest probability for GABHS.
- The model's negative predictors yielded a 12% posttest probability for GABHS.
Conclusions:
- The pediatric predictive model for GABHS pharyngitis demonstrated superior performance compared to physician estimates.
- The model's accuracy was comparable to rapid antigen detection tests.
- The model proved consistent across different populations and seasons, offering a valuable diagnostic aid when testing is limited.
Context:
Group A beta-hemolytic streptococcus (GABHS) pharyngitis is a common childhood illness. The clinical diagnosis is difficult to determine and laboratory tests have limitations; hence, the condition is generally overdiagnosed and overtreated. Several clinical pediatric-specific predictive models have been published but none have been prospectively studied.
Objective:
To test the performance of a previously published predictive model for GABHS pharyngitis in children in different clinical settings and during different seasons.
Design:
Prospective cohort study.
Settings:
Pediatric emergency department and 2 pediatric outpatient clinics.
Patients:
Children aged between 1 and 18 years with pharyngitis on initial examination at study sites between April 1, 1999, and March 31, 2000.
Interventions:
Recording of clinical features during initial evaluation using a standardized form and recovery of GABHS from patients' throats using reference standard methods.
Main Outcome Measures:
Posttest probability for GABHS positive throat culture associated with the model's positive predictors (moderate to severe tonsillar swelling, cervical lymphadenopathy [moderate to severe tenderness and enlargement of cervical lymph nodes], scarletiniform rash, and the absence of coryza) and the models' negative predictors (absence of the above signs and the presence of coryza).
Results:
Of 587 patients analyzed, 218 (37%) had a positive throat culture for GABHS. Forty-nine percent were boys. Mean +/- SD age was 6.7 +/- 3.9 years. There was no difference between the subsets within the sample. The posttest probability values for a positive throat culture associated with positive and negative predictors of the model were 79% and 12%, respectively.
Conclusions:
A pediatric predictive model for GABHS pharyngitis performed better than physicians' subjective estimates for a positive throat culture and was comparable with a rapid antigen detection test. The model performed consistently well in different populations and across seasons. It can be useful if reliable microbiological testing and/or follow-up are not attainable.
Related Concept Videos
01:30Acute Pharyngitis
Acute pharyngitis is the inflammation of the back of the throat (pharynx), commonly resulting in a sore throat. It is a frequently encountered condition that prompts individuals to seek medical advice.
Classification
Acute pharyngitis can be categorized based on its underlying cause:
01:27Streptococcal Pharyngitis